is 2 1968599 - 1
has 592608 decimal digits
takes 0.129 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFFB7966A0F0FE19Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.093968.6567%3000000900000000.73798.2083%15.831971.2295%2.5727%
PrimeNet2580.019563.7931%80001400000.00142.4713%0.021064.6879%0.8948%
GPU722620.312166.1290%80001000000.00121.1957%0.313366.5340%0.4050%
Difference+5+14.7819+2.5277%+2992000+89900000+0.7367+7.0126%+15.5185+4.6954%+4.6954%

Known prime factors (2 factors, 141.6 bits, 0.00719205% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19685997457810083026464422392169.337189419228675481
3 × 7 × 653 × 1667 × 8286211
2011-04-201667828621199.570.04320.0804
196859955975827134147010248232272.2451421717351632989
3 × 43 × 61 × 180673192481
2021-02-2861180673192481966.31938.461,752.8

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1968599417457088006787934566461716574654817469869743141.583
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-04-20T09:41:00kurlyhex40000400002169.3370.0040.2590.0080.504%
2021-02-28T22:25:13riccardo ubertiColab_noGPU1430000009000000012-
skipped known factor: 745781008302646442239
--0.738--8.208%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00ANONYMOUSv4_computers21258--0.020--
2022-03-09T05:51:27LordJuliusManual testing21260--0.078--
2010-01-03T05:48:00S485122USB-W260261--0.078--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.436 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:25.436 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
201100010.5990.002%
25500001.00136.738%
302500000.06493.816%
3510000000.00399.700%


ECM Summary

B1B2factorcurvesGHz-days
500005000000312.617
50000500000030.253
50000675000070.674
50000711379470.692
50000750000020921.20


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computersFFB7966A0F0FE19E0.129


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T10:18:55Oliver KruseGTX-0
745781008302646442239
D3E4E142744F12__no
2017-11-12T02:38:27kkmrkkblmbrbkc4.xlarge
745781008302646442239
D3E4E142744F12__no
2021-02-28T16:35:03riccardo ubertiColab_noGPU12
745781008302646442239
5597582713414701024823
5ED09E5267E7C87Bno


P-1 factor-bounds graph:
B1 = 3000000, B2 = 90000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-02T10:15:43+00:00