is 2 3986987 - 1
has 1200203 decimal digits
takes 0.497 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2361BA3A18517A57double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual271119.909769.0141 %510000015749383650156.051612.5389 %275.961372.8994 %
Target2651.829966.1538 %2000018000000.02121.7024 %1.851066.7300 %
Difference+6+118.0798+2.8602 %+5080000+15747583650+156.0305+10.8365%+274.1103+6.1693 %

Known prime factors (1 factor, 88.1 bits, 0.00220977% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
39869873324081667225650582639544812788.10341686637895052712520
23 × 3 × 5 × 7 × 15803 × 3140349925651
2023-07-2315803314034992565115,722,62130,94257,791

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-27Carsten Kossendeymother20000290000--0.0061.602%
2011-09-17Squeeky_SquirrelT7500_22007000011900006--0.0243.070%
2014-11-25JossManual testing8609886098--0.0161.257%
2015-09-14Squeeky_SquirrelP4_260019000048450006--0.0804.861%
2016-10-18Squeeky_Squirreli5-5250U_1600245000686000012--0.0975.374%
2022-03-15KingTest5000000405092520--4.84612.870%
2023-06-29Sid & AndyMagic_8_Ball510000015749383650--164.718.332%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-08-31ANONYMOUSv4_computers212610.039
2011-02-26Grant McCrackenhome2612620.077
2012-02-20GrunwalderGIMPManual testing212630.400
2016-02-23Mark RoseManual testing2622630.246
2013-07-11JayderManual testing2632640.492
2013-10-16David CampeauManual testing2642650.937
2016-01-28ramgeisManual testing2652661.874
2016-12-16Gordon SpenceManual testing2662673.749
2018-12-20YxinityManual testing2672687.497
2020-05-08TJAOIManual testing26826914.99
2021-05-17axnManual testing26927029.99
2021-06-02ANONYMOUSManual testing27027159.98


ECM factoring results:
Total ECM effort:14.563 GHz-days
Estimated T-Level:20.947
DigitsB1CompleteFacMiss
20110002.01413.344%
25500000.18982.745%
302500000.01298.799%


ECM Summary

B1B2factorcurvesGHz-days
500005000000192.955
50000675000071.292
50000700000071.318
5000032425470148.998


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-04ANONYMOUSv4_computers2361BA3A18517A570.497
1999-09-14ANONYMOUSv4_computers2361BA3A18517A570.497


PRP results:
dateuseridcompidcofactorsres64
2023-07-24carlos56citronella
332408166722565058263954481
4F95225B4D87F663


CERT results:
dateuseridcompid
2023-07-24Stef42z8g4


P-1 factor-bounds graph:
B1 = 5100000, B2 = 15749383650 (P-1 stage 2)
B1 = 5000000, B2 = 405092520 (P-1 stage 2)
B1 = 5100000 (P-1 stage 1)
B1 = 5000000 (P-1 stage 1)
B1 = 245000, B2 = 6860000 (P-1 stage 2)
B1 = 190000, B2 = 4845000 (P-1 stage 2)
B1 = 245000 (P-1 stage 1)
B1 = 190000 (P-1 stage 1)
B1 = 70000, B2 = 1190000 (P-1 stage 2)
B1 = 86098 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=20.95 ~= 53-bit
250
260
270
280
290
JSON version of this page
Last modified: 2024-02-09T03:30:02+00:00