is 2 2503817 - 1
has 753725 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4B4590DC61F04DE5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.867467.1642%30000080000000.07244.3768%11.939868.6013%1.4371%
PrimeNet2590.030762.7119%100001800000.00192.5386%0.032663.6585%0.9466%
GPU722630.637465.0794%110001700000.00201.4079%0.639465.5710%0.4916%
Difference+4+11.2300+2.0848%+289000+7830000+0.0704+2.9689%+11.3004+3.0303%+3.0303%

Known prime factors (1 factor, 66.4 bits, 0.00265263% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2503817985130044319133128172066.41719672564814424
23 × 32 × 273230066867
2012-07-2792732300668677.16971,497.22,796.3

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.291%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.930%
2010-12-16T22:40:00Jocelyn LaroucheManual testing2000020000---0.002--0.314%
2011-01-01T00:57:00Jocelyn LaroucheManual testing3000030000---0.003--0.431%
2011-01-04T22:09:00Jocelyn LaroucheManual testing5000050000---0.005--0.617%
2011-03-02T00:11:00James Heinrichi7-9203000008000000---0.072--4.377%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T03:34:11LordJuliusManual testing21260--0.061--
2009-01-30T03:20:00Sturle Sundeginjtje.ifi260261--0.061--
2012-06-12T09:43:00Sebastian HornbostelManual testing261262--0.123--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.552 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.552 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000060.552


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers4B4590DC61F04DE50.174


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:23:35alpertronManual testing
98513004431913312817
36A3EB23A4FCCC__no
2017-11-07T15:18:10Oliver KruseGTX-1
98513004431913312817
36A3EB23A4FCCC__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-03-10T03:34:11+00:00