3x+1 Class records calculation progress map
Status of the 3x+1 class record progress as of: Apr 6, 2020.
Intervals are indicated in blocks of 100,000,000,000,000 (100 E+12 or 100 trillion numbers).
Calculation of a single block takes approximately 3-6 days of (idle) time on 3 GHz processor.

All class records found so far can be viewed on the class records page.
This project can only run because of many cooperating contributors.
If you would like to contribute one or more blocks please go to the search page.
Note : the 3x+1 problem is just one of many distributed projects on the internet.
Trajectory of 63,728,127
Progress history
March 12 2020 : All blocks up to 710,300 completed. One more class record confirmed.
March 1 2020 : All blocks up to 698,000 completed. Six more class records confirmed.
February 15 2020 : All blocks up to 651,300 completed. Six class records confirmed.
January 8 2020 : All blocks up to 603,900 completed.
December 25 2019 : All blocks up to 602,000 completed. Four more class records confirmed.
December 21 2019 : All blocks up to 582,900 completed. Lowest missing class record (2073) and four others confirmed.
December 15 2019 : All blocks up to 563,300 completed.
September 29 2019 : All blocks up to 561,200 completed. Delay record 2277 and eight more class record confirmed.
July 11 2019 : All blocks up to 509,000 completed. One more class record confirmed.
May 12 2019 : All blocks up to 506,600 completed. One more class record confirmed.
May 5 2019 : All blocks up to 500,000 completed. Delay record 2264 and five more class records confirmed.
April 5 2019 : All blocks up to 476,400 completed. Three more class records confirmed.
Show/Hide earlier milestones
March 2019 : All blocks up to 455,200 completed. Lowest missing class record (2070) and four others confirmed.
December 2018 : All blocks up to 387,000 completed. Delay record 2261 and nine more class records confirmed.
October 2018 : All blocks up to 366,400 completed. Six more class records confirmed.
June 2018 : All blocks up to 346,000 completed. Three more class records confirmed.
December 2017 : All blocks up to 326,500 completed. Five more class records confirmed.
May 2017 : All blocks up to 305,400 completed. 258 reached. Two more class record confirmed.
October 2016 : All blocks up to 280,000 completed. Delay record 2258 and two more class records confirmed.
March 2016 : All blocks up to 275,200 completed. Four more class records confirmed.
March 19 2016 : Possible new Delay Record (Delay 2258) found by Lutz.
December 2015 : All blocks up to 263,350 completed. Four more class records confirmed. 2100 class records known.
July 2015 : All blocks up to 245,500 completed. Five more class records confirmed.
December 2014 : All blocks up to 222,280 completed. Three more class records confirmed.
November 2014 : All blocks up to 213,800 completed. Delay record 2255 and two more class records confirmed.
May 2014 : All blocks up to 203,920 completed. Three class records confirmed.
February 2014 : All blocks up to 194,060 completed. Five class records confirmed. All class records up to 2050 known.
November 2013 : All blocks up to 184,000 completed. Three more class records confirmed
June 2013 : All blocks up to 166,700 completed. Two more class records confirmed.
April 2013 : All blocks up to 165,200 completed. One more class record confirmed.
February 2013 : All blocks up to 160,740 completed. Six more class records confirmed.
November 2012 : All blocks up to 148,800 completed. Five more class records confirmed
May 2012 : All blocks up to 132,360 completed. Five class records confirmed.
January 2012 : All blocks up to 121,500 completed. Final missing class record below 2000 found.
December 2011 : All blocks up to 120,200 completed. One class record confirmed.
October 2011 : All blocks up to 117,000 completed. Three more class record confirmed.
July 2011 : All blocks up to 107,500 completed. Delay record 2254 and three class records confirmed.
April 2011 : All blocks up to 97,080 completed. Delay Record 2091 and two other class records confirmed.
November 2010 : All blocks up to 91,880 completed. Three class records confirmed.
August 2010 : All blocks up to 90,000 completed. Four more class records confirmed.
February 2010 : All blocks up to 82,700 completed. Two class records confirmed.
June 2009 : All blocks up to 76,160 completed. The lowest missing CR (1964) and one other confirmed.
April 2009 : All blocks up to 72,520 completed, passing 256. Three class records confirmed.
February 2009 : All blocks up to 71,020 completed. One more class record confirmed.
December 2008 : All blocks up to 69,740 completed. The lowest missing CR (1951) and two more confirmed.
November 2008 : All blocks up to 67,500 completed. Class record 2000 finally confirmed.
October 2008 : All blocks up to 66,380 completed. Four more class records confirmed.
May 2008 : All blocks up to 61,160 completed. The lowest missing CR (1925) and three others confirmed.
December 2007 : All blocks up to 58,600 completed. Four class records confirmed.
April 2007 : All blocks up to 54,540 completed. Five more class records confirmed.
October 2006 : All blocks up to 50,000 completed. Delay Record 2090 and five class records confirmed.
November 2005 : All blocks up to 46,100 completed. Double of Record 2045 confirmed as Delay Record 2046.
August 2005 : All blocks up to 45,040 completed. Five class records confirmed.
May 2005 : Delay Record of 2090 found at ±46,785 E+12 by Eric
February 2005 : All blocks up to 42,060 completed. Three more class record confirmed.
November 2004 : All blocks up to 40,000 completed. Four class records confirmed.
August 2004 : All blocks up to 37,500 completed. Another four class records confirmed.
May 2004 : All blocks up to 36,120 completed. Seven class records confirmed.
January 2004 : All blocks up to 31,960 completed. Five further class records confirmed.
November 2003 : All blocks up to 29,840 completed. One more class record confirmed.
August 2003 : All blocks up to 29,240 completed. Another fifteen class records confirmed.
April 2003 : All blocks up to 23,100 completed. Delay record 2045 and seven class records confirmed.
December 2002 : All blocks up to 20,100 completed. All class records below 1900 known.
November 2002 : All blocks up to 20,000 completed. Delay record 2042 and fourteen class records confirmed.
November 2002 : Delay Record of 2045 found at ±22,702 E+12 by Kevin
July 2002 : All blocks up to 16,460 completed. Delay record 2039 and fifteen class records confirmed.
April 2002 : All blocks up to 12,720 completed. Another fourteen class records confirmed.
March 2002 : Delay Record of 2042 found at ±17,026 E+12 by Michael
February 2002 : All blocks up to 9340 completed. Two more class records confirmed.
December 2001 : Delay Record of 2039 found at ±12,770 E+12 by Billy
November 2001 : All blocks up to 9020 completed. One Delay record and ten class records confirmed.
September 2001 : All blocks up to 6800 completed. Three Delay records and fourteen class records confirmed. 
August 2001 : All blocks up to 3600 completed. Two Delay records and five class records confirmed
June 2001 : Delay Record of 1958 found at ±7579 E+12 by Kevin
May 2001 : Delay Record of 1919 found at ±6482 E+12 by Kevin
April 2001 : Delay Record of 1916 found at ±4861 E+12 by Kevin
March 2001 : Delay Record of 1903 found at ±4320 E+12 by Kevin
March 2001 : Delay Record of 1895 found at ±3586 E+12 by Eric
March 2001 : Delay Record of 1874 found at ±2978 E+12 by Kevin
February 2001 : All blocks up to 2620 completed. Three class records confirmed.
January 2001 : New Class and Delay Record of 1871 found at 2234,047405,400065.

Range 2000-20000
completed (view)
Range 20000-40000
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Range 40000-60000
completed (view)
Range 60000-80000
completed (view)
Range 80000-100000
completed (view)
Range 100000-120000
completed (view)
Range 120000-140000
completed (view)
Range 140000-160000
completed (view)
Range 160000-180000
completed (view)
Range 180000-200000
completed (view)
Range 200000-300000
completed (view)
Range 300000-400000
completed (view)
Range 400000-500000
completed (view)
Range 500000-600000
completed (view)
Range 600000-700000
completed (view)
Not yet assigned Assigned,
not yet started
Assigned,
in progress
Entire interval
completed
Interval completed
class record found
700000-100
Daniel
700100-200
Daniel
700200-300
Daniel
700300-400
Daniel
700400-500
Daniel
700500-600
Daniel
700600-700
Daniel
700700-800
Daniel
700800-900
Daniel
700900-000
Daniel
701000-100
Daniel
701100-200
Daniel
701200-300
Daniel
701300-400
Daniel
701400-500
Daniel
701500-600
Daniel
701600-700
Daniel
701700-800
Daniel
701800-900
Daniel
701900-000
Daniel
702000-100
Daniel
702100-200
Daniel
702200-300
Daniel
702300-400
Daniel
702400-500
Daniel
702500-600
Daniel
702600-700
Daniel
702700-800
Daniel
702800-900
Daniel
702900-000
Daniel
703000-100
Daniel
703100-200
Daniel
703200-300
Daniel
703300-400
Daniel
703400-500
Daniel
703500-600
Daniel
703600-700
Daniel
703700-800
Daniel
703800-900
Daniel
703900-000
Daniel
704000-100
Daniel
704100-200
Daniel
704200-300
Daniel
704300-400
Daniel
704400-500
Daniel
704500-600
Daniel
704600-700
Daniel
704700-800
Daniel
704800-900
Daniel
704900-000
Daniel
705000-100
Daniel
705100-200
Daniel
705200-300
Daniel
705300-400
Daniel
705400-500
Daniel
705500-600
Daniel
705600-700
Daniel
705700-800
Daniel
705800-900
Daniel
705900-000
Daniel
706000-100
Daniel
706100-200
Daniel
706200-300
Daniel
706300-400
Daniel
706400-500
Daniel
706500-600
Daniel
706600-700
Daniel
706700-800
Daniel
706800-900
Daniel
706900-000
Daniel
707000-100
Daniel
707100-200
Daniel
707200-300
Daniel
707300-400
Daniel
707400-500
Daniel
707500-600
Daniel
707600-700
Daniel
707700-800
Daniel
707800-900
Daniel
707900-000
Daniel
708000-100
Daniel
708100-200
Daniel
708200-300
Daniel
708300-400
Daniel
708400-500
Daniel
708500-600
Daniel
708600-700
Daniel
708700-800
Daniel
708800-900
Daniel
708900-000
Daniel
709000-100
Daniel
709100-200
Daniel
709200-300
Daniel
709300-400
Daniel
709400-500
Daniel
709500-600
Daniel
709600-700
Daniel
709700-800
Daniel
709800-900
Daniel
709900-000
Daniel
710000-100
Lutz
710100-200
Lutz
710200-300
Lutz
710300-400
Lutz
710400-500
Lutz
710500-600
Lutz
710600-700
Lutz
710700-800
Lutz
710800-900
Lutz
710900-000
Lutz
711000-100
Lutz
711100-200
Lutz
711200-300
Lutz
711300-400
Lutz
711400-500
Lutz
711500-600
Lutz
711600-700
Lutz
711700-800
Lutz
711800-900
Lutz
711900-000
Lutz
712000-100
Frank H
712100-200
George C
712200-300
George C
712300-400
George C
712400-500
George C
712500-600
George C
712600-700
George C
712700-800
Bob
712800-900
Bob
712900-000
Eric
713000-100
Eric
713100-200
Eric
713200-300
Eric
713300-400
Eric
713400-500
Eric
713500-600
Frank H
713600-700
Luiz
713700-800
Luiz
713800-900
Luiz
713900-000
Luiz
714000-100
Steven
714100-200
Steven
714200-300
Steven
714300-400
Steven
714400-500
Steven
714500-600
Steven
714600-700
Steven
714700-800
Steven
714800-900
Eric
714900-000
Eric
715000-100
Lutz
715100-200
Lutz
715200-300
Lutz
715300-400
Lutz
715400-500
Lutz
715500-600
Lutz
715600-700
Lutz
715700-800
Lutz
715800-900
Lutz
715900-000
Lutz
716000-100
Frank H
716100-200
George C
716200-300
George C
716300-400
George C
716400-500
George C
716500-600
George C
716600-700
George C
716700-800
Frank H
716800-900
Eric
716900-000
Eric
717000-100
Eric
717100-200
Eric
717200-300
Eric
717300-400
Eric
717400-500
Eric
717500-600
Eric
717600-700
Eric
717700-800
Eric
717800-900
Eric
717900-000
Eric
718000-100
Eric
718100-200
Eric
718200-300
Eric
718300-400
Eric
718400-500
Eric
718500-600
Eric
718600-700
Eric
718700-800
Eric
718800-900
Eric
718900-000
Eric
719000-100
Eric
719100-200
Eric
719200-300
Eric
719300-400
Eric
719400-500
Eric
719500-600
Eric
719600-700
Eric
719700-800
Eric
719800-900
Eric
719900-000
Eric
720000-100
Wenjie
720100-200
Wenjie
720200-300
Wenjie
720300-400
Wenjie
720400-500
Wenjie
720500-600
Wenjie
720600-700
Wenjie
720700-800
Wenjie
720800-900
Wenjie
720900-000
Wenjie
721000-100
Wenjie
721100-200
Wenjie
721200-300
Wenjie
721300-400
Wenjie
721400-500
Wenjie
721500-600
Wenjie
721600-700
Wenjie
721700-800
Wenjie
721800-900
Wenjie
721900-000
Wenjie
722000-100
Wenjie
722100-200
Wenjie
722200-300
Wenjie
722300-400
Wenjie
722400-500
Wenjie
722500-600
Wenjie
722600-700
Wenjie
722700-800
Wenjie
722800-900
Wenjie
722900-000
Wenjie
723000-100
Wenjie
723100-200
Wenjie
723200-300
Wenjie
723300-400
Wenjie
723400-500
Wenjie
723500-600
Wenjie
723600-700
Wenjie
723700-800
Wenjie
723800-900
Wenjie
723900-000
Wenjie
724000-100
Wenjie
724100-200
Wenjie
724200-300
Wenjie
724300-400
Wenjie
724400-500
Wenjie
724500-600
Wenjie
724600-700
Wenjie
724700-800
Wenjie
724800-900
Wenjie
724900-000
Wenjie
725000-100
Wenjie
725100-200
Wenjie
725200-300
Wenjie
725300-400
Wenjie
725400-500
Wenjie
725500-600
Wenjie
725600-700
Wenjie
725700-800
Wenjie
725800-900
Wenjie
725900-000
Wenjie
726000-100
Wenjie
726100-200
Wenjie
726200-300
Wenjie
726300-400
Wenjie
726400-500
Wenjie
726500-600
Wenjie
726600-700
Wenjie
726700-800
Wenjie
726800-900
Wenjie
726900-000
Wenjie
727000-100
Wenjie
727100-200
Wenjie
727200-300
Wenjie
727300-400
Wenjie
727400-500
Wenjie
727500-600
Wenjie
727600-700
Wenjie
727700-800
Wenjie
727800-900
Wenjie
727900-000
Wenjie
728000-100
Wenjie
728100-200
Wenjie
728200-300
Wenjie
728300-400
Wenjie
728400-500
Wenjie
728500-600
Wenjie
728600-700
Wenjie
728700-800
Wenjie
728800-900
Wenjie
728900-000
Wenjie
729000-100
Wenjie
729100-200
Wenjie
729200-300
Wenjie
729300-400
Wenjie
729400-500
Wenjie
729500-600
Wenjie
729600-700
Wenjie
729700-800
Wenjie
729800-900
Wenjie
729900-000
Wenjie
730000-100
Wenjie
730100-200
Wenjie
730200-300
Wenjie
730300-400
Wenjie
730400-500
Wenjie
730500-600
Wenjie
730600-700
Wenjie
730700-800
Wenjie
730800-900
Wenjie
730900-000
Wenjie
731000-100
Wenjie
731100-200
Wenjie
731200-300
Wenjie
731300-400
Wenjie
731400-500
Wenjie
731500-600
Wenjie
731600-700
Wenjie
731700-800
Wenjie
731800-900
Wenjie
731900-000
Wenjie
732000-100
Wenjie
732100-200
Wenjie
732200-300
Wenjie
732300-400
Wenjie
732400-500
Wenjie
732500-600
Wenjie
732600-700
Wenjie
732700-800
Wenjie
732800-900
Wenjie
732900-000
Wenjie
733000-100
Wenjie
733100-200
Wenjie
733200-300
Wenjie
733300-400
Wenjie
733400-500
Wenjie
733500-600
Wenjie
733600-700
Wenjie
733700-800
Wenjie
733800-900
Wenjie
733900-000
Wenjie
734000-100
Wenjie
734100-200
Wenjie
734200-300
Wenjie
734300-400
Wenjie
734400-500
Wenjie
734500-600
Wenjie
734600-700
Wenjie
734700-800
Wenjie
734800-900
Wenjie
734900-000
Wenjie
735000-100
Wenjie
735100-200
Wenjie
735200-300
Wenjie
735300-400
Wenjie
735400-500
Wenjie
735500-600
Wenjie
735600-700
Wenjie
735700-800
Wenjie
735800-900
Wenjie
735900-000
Wenjie
736000-100
Wenjie
736100-200
Wenjie
736200-300
Wenjie
736300-400
Wenjie
736400-500
Wenjie
736500-600
Wenjie
736600-700
Wenjie
736700-800
Wenjie
736800-900
Wenjie
736900-000
Wenjie
737000-100
Wenjie
737100-200
Wenjie
737200-300
Wenjie
737300-400
Wenjie
737400-500
Wenjie
737500-600
Wenjie
737600-700
Wenjie
737700-800
Wenjie
737800-900
Wenjie
737900-000
Wenjie
738000-100
Wenjie
738100-200
Wenjie
738200-300
Wenjie
738300-400
Wenjie
738400-500
Wenjie
738500-600
Wenjie
738600-700
Wenjie
738700-800
Wenjie
738800-900
Wenjie
738900-000
Wenjie
739000-100
Wenjie
739100-200
Wenjie
739200-300
Wenjie
739300-400
Wenjie
739400-500
Wenjie
739500-600
Wenjie
739600-700
Wenjie
739700-800
Wenjie
739800-900
Wenjie
739900-000
Wenjie
740000-100
Kevin
740100-200
Kevin
740200-300
Kevin
740300-400
Kevin
740400-500
Kevin
740500-600
Kevin
740600-700
Kevin
740700-800
Kevin
740800-900
Kevin
740900-000
Kevin
741000-100
Kevin
741100-200
Kevin
741200-300
Kevin
741300-400
Kevin
741400-500
Kevin
741500-600
Kevin
741600-700
Kevin
741700-800
Kevin
741800-900
Kevin
741900-000
Kevin
742000-100
Kevin
742100-200
Kevin
742200-300
Kevin
742300-400
Kevin
742400-500
Kevin
742500-600
Kevin
742600-700
Kevin
742700-800
Kevin
742800-900
Kevin
742900-000
Kevin
743000-100
Kevin
743100-200
Kevin
743200-300
Kevin
743300-400
Kevin
743400-500
Kevin
743500-600
Kevin
743600-700
Kevin
743700-800
Kevin
743800-900
Kevin
743900-000
Kevin
744000-100
Kevin
744100-200
Kevin
744200-300
Kevin
744300-400
Kevin
744400-500
Kevin
744500-600
Kevin
744600-700
Kevin
744700-800
Kevin
744800-900
Kevin
744900-000
Kevin
745000-100
Kevin
745100-200
Kevin
745200-300
Kevin
745300-400
Kevin
745400-500
Kevin
745500-600
Kevin
745600-700
Kevin
745700-800
Kevin
745800-900
Kevin
745900-000
Kevin
746000-100
Kevin
746100-200
Kevin
746200-300
Kevin
746300-400
Kevin
746400-500
Kevin
746500-600
Kevin
746600-700
Kevin
746700-800
Kevin
746800-900
Kevin
746900-000
Kevin
747000-100
Kevin
747100-200
Kevin
747200-300
Kevin
747300-400
Kevin
747400-500
Kevin
747500-600
Kevin
747600-700
Kevin
747700-800
Kevin
747800-900
Kevin
747900-000
Kevin
748000-100
Kevin
748100-200
Kevin
748200-300
Kevin
748300-400
Kevin
748400-500
Kevin
748500-600
Kevin
748600-700
Kevin
748700-800
Kevin
748800-900
Kevin
748900-000
Kevin
749000-100
Kevin
749100-200
Kevin
749200-300
Kevin
749300-400
Kevin
749400-500
Kevin
749500-600
Kevin
749600-700
Kevin
749700-800
Kevin
749800-900
Kevin
749900-000
Kevin
750000-100
Kevin
750100-200
Kevin
750200-300
Kevin
750300-400
Kevin
750400-500
Kevin
750500-600
Kevin
750600-700
Kevin
750700-800
Kevin
750800-900
Kevin
750900-000
Kevin
751000-100
Kevin
751100-200
Kevin
751200-300
Kevin
751300-400
Kevin
751400-500
Kevin
751500-600
Kevin
751600-700
Kevin
751700-800
Kevin
751800-900
Kevin
751900-000
Kevin
752000-100
Kevin
752100-200
Kevin
752200-300
Kevin
752300-400
Kevin
752400-500
Kevin
752500-600
Kevin
752600-700
Kevin
752700-800
Kevin
752800-900
Kevin
752900-000
Kevin
753000-100
Kevin
753100-200
Kevin
753200-300
Kevin
753300-400
Kevin
753400-500
Kevin
753500-600
Kevin
753600-700
Kevin
753700-800
Kevin
753800-900
Kevin
753900-000
Kevin
754000-100
Kevin
754100-200
Kevin
754200-300
Kevin
754300-400
Kevin
754400-500
Kevin
754500-600
Kevin
754600-700
Kevin
754700-800
Kevin
754800-900
Kevin
754900-000
Kevin
755000-100
Kevin
755100-200
Kevin
755200-300
Kevin
755300-400
Kevin
755400-500
Kevin
755500-600
Kevin
755600-700
Kevin
755700-800
Kevin
755800-900
Kevin
755900-000
Kevin
756000-100
Kevin
756100-200
Kevin
756200-300
Kevin
756300-400
Kevin
756400-500
Kevin
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Luiz
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Luiz
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Luiz
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Etienne
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Etienne
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Steven
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Frank H
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George C
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George C
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George C
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Eric
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Eric
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Eric
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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Lutz
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829900-000
Contributions by
EricEric Roosendaal, Netherlands (author) LutzLutz Nebe, Germany
KevinKevin Hebb, Alberta, Canada BobBob Coffman, USA
WenjieFang Wenjie, China StevenSteven Cuthbert, England
LuizLuiz Antonio Souza, Brazil DanielDaniel Podobinski
George CGeorge Cunningham Frank HFrank Hubeny
EtienneEtienne, Brisbane   

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