3x+1 Class records calculation progress map
Status of the 3x+1 class record progress as of: Jan 14, 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 7 days of (idle) time on 2.4 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
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
completed (view)
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)
 
Not yet assigned Assigned,
not yet started
Assigned,
in progress
Entire interval
completed
Interval completed
class record found
600000-100
Steven
600100-200
Steven
600200-300
Steven
600300-400
Steven
600400-500
Steven
600500-600
Steven
600600-700
Steven
600700-800
Steven
600800-900
Eric
600900-000
Eric
601000-100
Eric
601100-200
Eric
601200-300
Eric
601300-400
Eric
601400-500
Teodor
601500-600
Teodor
601600-700
Eric
601700-800
Eric
601800-900
Daniel
601900-000
Daniel
602000-100
Lutz
602100-200
Lutz
602200-300
Lutz
602300-400
Lutz
602400-500
Lutz
602500-600
Lutz
602600-700
Lutz
602700-800
Lutz
602800-900
Lutz
602900-000
Lutz
603000-100
Lutz
603100-200
Lutz
603200-300
Lutz
603300-400
Lutz
603400-500
Lutz
603500-600
Lutz
603600-700
Lutz
603700-800
Lutz
603800-900
Lutz
603900-000
Lutz
604000-100
Eric
604100-200
George C
604200-300
Chris:
604300-400
Chris:
604400-500
Luiz
604500-600
Luiz
604600-700
Luiz
604700-800
Luiz
604800-900
Daniel
604900-000
Daniel
605000-100
Steven
605100-200
Steven
605200-300
Steven
605300-400
Steven
605400-500
Steven
605500-600
Steven
605600-700
Steven
605700-800
Steven
605800-900
Bob
605900-000
Bob
606000-100
Kevin
606100-200
Kevin
606200-300
Kevin
606300-400
Kevin
606400-500
Kevin
606500-600
Kevin
606600-700
Kevin
606700-800
Kevin
606800-900
Kevin
606900-000
Kevin
607000-100
Kevin
607100-200
Kevin
607200-300
Kevin
607300-400
Kevin
607400-500
Kevin
607500-600
Kevin
607600-700
Kevin
607700-800
Kevin
607800-900
Kevin
607900-000
Kevin
608000-100
Kevin
608100-200
Kevin
608200-300
Kevin
608300-400
Kevin
608400-500
Kevin
608500-600
Kevin
608600-700
Kevin
608700-800
Kevin
608800-900
Kevin
608900-000
Kevin
609000-100
Kevin
609100-200
Kevin
609200-300
Kevin
609300-400
Kevin
609400-500
Kevin
609500-600
Kevin
609600-700
Kevin
609700-800
Kevin
609800-900
Kevin
609900-000
Kevin
610000-100
Wenjie
610100-200
Wenjie
610200-300
Wenjie
610300-400
Wenjie
610400-500
Wenjie
610500-600
Wenjie
610600-700
Wenjie
610700-800
Wenjie
610800-900
Wenjie
610900-000
Wenjie
611000-100
Wenjie
611100-200
Wenjie
611200-300
Wenjie
611300-400
Wenjie
611400-500
Wenjie
611500-600
Wenjie
611600-700
Wenjie
611700-800
Wenjie
611800-900
Wenjie
611900-000
Wenjie
612000-100
Wenjie
612100-200
Wenjie
612200-300
Wenjie
612300-400
Wenjie
612400-500
Wenjie
612500-600
Wenjie
612600-700
Wenjie
612700-800
Wenjie
612800-900
Wenjie
612900-000
Wenjie
613000-100
Wenjie
613100-200
Wenjie
613200-300
Wenjie
613300-400
Wenjie
613400-500
Wenjie
613500-600
Wenjie
613600-700
Wenjie
613700-800
Wenjie
613800-900
Wenjie
613900-000
Wenjie
614000-100
Wenjie
614100-200
Wenjie
614200-300
Wenjie
614300-400
Wenjie
614400-500
Wenjie
614500-600
Wenjie
614600-700
Wenjie
614700-800
Wenjie
614800-900
Wenjie
614900-000
Wenjie
615000-100
Wenjie
615100-200
Wenjie
615200-300
Wenjie
615300-400
Wenjie
615400-500
Wenjie
615500-600
Wenjie
615600-700
Wenjie
615700-800
Wenjie
615800-900
Wenjie
615900-000
Wenjie
616000-100
Wenjie
616100-200
Wenjie
616200-300
Wenjie
616300-400
Wenjie
616400-500
Wenjie
616500-600
Wenjie
616600-700
Wenjie
616700-800
Wenjie
616800-900
Wenjie
616900-000
Wenjie
617000-100
Wenjie
617100-200
Wenjie
617200-300
Wenjie
617300-400
Wenjie
617400-500
Wenjie
617500-600
Wenjie
617600-700
Wenjie
617700-800
Wenjie
617800-900
Wenjie
617900-000
Wenjie
618000-100
Wenjie
618100-200
Wenjie
618200-300
Wenjie
618300-400
Wenjie
618400-500
Wenjie
618500-600
Wenjie
618600-700
Wenjie
618700-800
Wenjie
618800-900
Wenjie
618900-000
Wenjie
619000-100
Wenjie
619100-200
Wenjie
619200-300
Wenjie
619300-400
Wenjie
619400-500
Wenjie
619500-600
Wenjie
619600-700
Wenjie
619700-800
Wenjie
619800-900
Wenjie
619900-000
Wenjie
620000-100
Kevin
620100-200
Kevin
620200-300
Kevin
620300-400
Kevin
620400-500
Kevin
620500-600
Kevin
620600-700
Kevin
620700-800
Kevin
620800-900
Kevin
620900-000
Kevin
621000-100
Kevin
621100-200
Kevin
621200-300
Kevin
621300-400
Kevin
621400-500
Kevin
621500-600
Kevin
621600-700
Kevin
621700-800
Kevin
621800-900
Kevin
621900-000
Kevin
622000-100
Kevin
622100-200
Kevin
622200-300
Kevin
622300-400
Kevin
622400-500
Kevin
622500-600
Kevin
622600-700
Kevin
622700-800
Kevin
622800-900
Kevin
622900-000
Kevin
623000-100
Kevin
623100-200
Kevin
623200-300
Kevin
623300-400
Kevin
623400-500
Kevin
623500-600
Kevin
623600-700
Kevin
623700-800
Kevin
623800-900
Kevin
623900-000
Kevin
624000-100
Kevin
624100-200
Kevin
624200-300
Kevin
624300-400
Kevin
624400-500
Kevin
624500-600
Kevin
624600-700
Kevin
624700-800
Kevin
624800-900
Kevin
624900-000
Kevin
625000-100
Kevin
625100-200
Kevin
625200-300
Kevin
625300-400
Kevin
625400-500
Kevin
625500-600
Kevin
625600-700
Kevin
625700-800
Kevin
625800-900
Kevin
625900-000
Kevin
626000-100
Kevin
626100-200
Kevin
626200-300
Kevin
626300-400
Kevin
626400-500
Kevin
626500-600
Kevin
626600-700
Kevin
626700-800
Kevin
626800-900
Kevin
626900-000
Kevin
627000-100
Kevin
627100-200
Kevin
627200-300
Kevin
627300-400
Kevin
627400-500
Kevin
627500-600
Kevin
627600-700
Kevin
627700-800
Kevin
627800-900
Kevin
627900-000
Kevin
628000-100
Kevin
628100-200
Kevin
628200-300
Kevin
628300-400
Kevin
628400-500
Kevin
628500-600
Kevin
628600-700
Kevin
628700-800
Kevin
628800-900
Kevin
628900-000
Kevin
629000-100
Kevin
629100-200
Kevin
629200-300
Kevin
629300-400
Kevin
629400-500
Kevin
629500-600
Kevin
629600-700
Kevin
629700-800
Kevin
629800-900
Kevin
629900-000
Kevin
630000-100
Kevin
630100-200
Kevin
630200-300
Kevin
630300-400
Kevin
630400-500
Kevin
630500-600
Kevin
630600-700
Kevin
630700-800
Kevin
630800-900
Kevin
630900-000
Kevin
631000-100
Kevin
631100-200
Kevin
631200-300
Kevin
631300-400
Kevin
631400-500
Kevin
631500-600
Kevin
631600-700
Kevin
631700-800
Kevin
631800-900
Kevin
631900-000
Kevin
632000-100
Kevin
632100-200
Kevin
632200-300
Kevin
632300-400
Kevin
632400-500
Kevin
632500-600
Kevin
632600-700
Kevin
632700-800
Kevin
632800-900
Kevin
632900-000
Kevin
633000-100
Kevin
633100-200
Kevin
633200-300
Kevin
633300-400
Kevin
633400-500
Kevin
633500-600
Kevin
633600-700
Kevin
633700-800
Kevin
633800-900
Kevin
633900-000
Kevin
634000-100
Kevin
634100-200
Kevin
634200-300
Kevin
634300-400
Kevin
634400-500
Kevin
634500-600
Kevin
634600-700
Kevin
634700-800
Kevin
634800-900
Kevin
634900-000
Kevin
635000-100
Kevin
635100-200
Kevin
635200-300
Kevin
635300-400
Kevin
635400-500
Kevin
635500-600
Kevin
635600-700
Kevin
635700-800
Kevin
635800-900
Kevin
635900-000
Kevin
636000-100
Kevin
636100-200
Kevin
636200-300
Kevin
636300-400
Kevin
636400-500
Kevin
636500-600
Kevin
636600-700
Kevin
636700-800
Kevin
636800-900
Kevin
636900-000
Kevin
637000-100
Kevin
637100-200
Kevin
637200-300
Kevin
637300-400
Kevin
637400-500
Kevin
637500-600
Kevin
637600-700
Kevin
637700-800
Kevin
637800-900
Kevin
637900-000
Kevin
638000-100
Kevin
638100-200
Kevin
638200-300
Kevin
638300-400
Kevin
638400-500
Kevin
638500-600
Kevin
638600-700
Kevin
638700-800
Kevin
638800-900
Kevin
638900-000
Kevin
639000-100
Kevin
639100-200
Kevin
639200-300
Kevin
639300-400
Kevin
639400-500
Kevin
639500-600
Kevin
639600-700
Kevin
639700-800
Kevin
639800-900
Kevin
639900-000
Kevin
640000-100
Kevin
640100-200
Kevin
640200-300
Kevin
640300-400
Kevin
640400-500
Kevin
640500-600
Kevin
640600-700
Kevin
640700-800
Kevin
640800-900
Kevin
640900-000
Kevin
641000-100
Kevin
641100-200
Kevin
641200-300
Kevin
641300-400
Kevin
641400-500
Kevin
641500-600
Kevin
641600-700
Kevin
641700-800
Kevin
641800-900
Kevin
641900-000
Kevin
642000-100
Kevin
642100-200
Kevin
642200-300
Kevin
642300-400
Kevin
642400-500
Kevin
642500-600
Kevin
642600-700
Kevin
642700-800
Kevin
642800-900
Kevin
642900-000
Kevin
643000-100
Kevin
643100-200
Kevin
643200-300
Kevin
643300-400
Kevin
643400-500
Kevin
643500-600
Kevin
643600-700
Kevin
643700-800
Kevin
643800-900
Kevin
643900-000
Kevin
644000-100
Kevin
644100-200
Kevin
644200-300
Kevin
644300-400
Kevin
644400-500
Kevin
644500-600
Kevin
644600-700
Kevin
644700-800
Kevin
644800-900
Kevin
644900-000
Kevin
645000-100
Kevin
645100-200
Kevin
645200-300
Kevin
645300-400
Kevin
645400-500
Kevin
645500-600
Kevin
645600-700
Kevin
645700-800
Kevin
645800-900
Kevin
645900-000
Kevin
646000-100
Kevin
646100-200
Kevin
646200-300
Kevin
646300-400
Kevin
646400-500
Kevin
646500-600
Kevin
646600-700
Kevin
646700-800
Kevin
646800-900
Kevin
646900-000
Kevin
647000-100
Kevin
647100-200
Kevin
647200-300
Kevin
647300-400
Kevin
647400-500
Kevin
647500-600
Kevin
647600-700
Kevin
647700-800
Kevin
647800-900
Kevin
647900-000
Kevin
648000-100
Kevin
648100-200
Kevin
648200-300
Kevin
648300-400
Kevin
648400-500
Kevin
648500-600
Kevin
648600-700
Kevin
648700-800
Kevin
648800-900
Kevin
648900-000
Kevin
649000-100
Kevin
649100-200
Kevin
649200-300
Kevin
649300-400
Kevin
649400-500
Kevin
649500-600
Kevin
649600-700
Kevin
649700-800
Kevin
649800-900
Kevin
649900-000
Kevin
650000-100
George C
650100-200
Daniel
650200-300
Daniel
650300-400
George C
650400-500
George C
650500-600
George C
650600-700
Luiz
650700-800
Luiz
650800-900
Luiz
650900-000
Luiz
651000-100
Lutz
651100-200
Lutz
651200-300
Lutz
651300-400
Lutz
651400-500
Lutz
651500-600
Lutz
651600-700
Lutz
651700-800
Lutz
651800-900
Lutz
651900-000
Lutz
652000-100
Lutz
652100-200
Lutz
652200-300
Lutz
652300-400
Lutz
652400-500
Lutz
652500-600
Lutz
652600-700
Lutz
652700-800
Lutz
652800-900
Lutz
652900-000
Lutz
653000-100
653100-200
653200-300
653300-400
653400-500
653500-600
653600-700
653700-800
653800-900
653900-000
654000-100
654100-200
654200-300
654300-400
654400-500
654500-600
654600-700
654700-800
654800-900
654900-000
655000-100
Kevin
655100-200
Kevin
655200-300
Kevin
655300-400
Kevin
655400-500
Kevin
655500-600
Kevin
655600-700
Kevin
655700-800
Kevin
655800-900
Kevin
655900-000
Kevin
656000-100
Kevin
656100-200
Kevin
656200-300
Kevin
656300-400
Kevin
656400-500
Kevin
656500-600
Kevin
656600-700
Kevin
656700-800
Kevin
656800-900
Kevin
656900-000
Kevin
657000-100
Kevin
657100-200
Kevin
657200-300
Kevin
657300-400
Kevin
657400-500
Kevin
657500-600
Kevin
657600-700
Kevin
657700-800
Kevin
657800-900
Kevin
657900-000
Kevin
658000-100
Kevin
658100-200
Kevin
658200-300
Kevin
658300-400
Kevin
658400-500
Kevin
658500-600
Kevin
658600-700
Kevin
658700-800
Kevin
658800-900
Kevin
658900-000
Kevin
659000-100
Kevin
659100-200
Kevin
659200-300
Kevin
659300-400
Kevin
659400-500
Kevin
659500-600
Kevin
659600-700
Kevin
659700-800
Kevin
659800-900
Kevin
659900-000
Kevin
660000-100
Kevin
660100-200
Kevin
660200-300
Kevin
660300-400
Kevin
660400-500
Kevin
660500-600
Kevin
660600-700
Kevin
660700-800
Kevin
660800-900
Kevin
660900-000
Kevin
661000-100
Kevin
661100-200
Kevin
661200-300
Kevin
661300-400
Kevin
661400-500
Kevin
661500-600
Kevin
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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 Chris:Christopher Peace, UK
TeodorTeodor Baev DanielDaniel Podobinski
George CGeorge C   

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