is 2 640402457 - 1
has 192780349 decimal digits
takes 19,367.727 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2846,117.821064.2857 %3600000128000000455.08543.8976 %6,572.906465.6777 %
Target2833,058.910463.8554 %36000008000000002,060.62874.4088 %5,119.539165.4490 %
Difference+1+3,058.9107+0.4303 %--672000000-1,605.5433-0.5112 %+1,453.3673+0.2287 %

Known prime factors (1 factor, 97.7 bits, 0.00001525% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6404024572522440808319436113990996910873097.671196941843425769063999
3 × 13 × 59 × 83269 × 224699 × 4574429
2020-12-30224699457442950,117,19220.24620.413

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2020-12-30KrieselManual testing360000012800000023097.671468.14.245%


Trial Factoring results:
57585960616263646566676869707172737475767778798081828384
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-08-02Architects CubedManual testing2632640.003
2010-10-29Architects Cubedm1_512642650.006
2014-03-29america64Manual testing2652660.012
2014-05-28sasakiManual testing2662670.023
2017-01-20sasakiManual testing2672680.047
2017-04-24sasakiManual testing2682690.093
2018-09-13Niels_Mache_NextcloudManual testing2692700.187
2020-06-03SRBaseManual testing2702710.373
2020-09-06KrieselManual testing2712720.747
2020-09-06KrieselManual testing2722731.494
2020-09-06KrieselManual testing2732742.987
2020-09-06KrieselManual testing2742755.974
2020-09-06KrieselManual testing27527611.95
2020-09-06KrieselManual testing27627723.90
2020-09-06KrieselManual testing27727847.80
2020-09-06KrieselManual testing27827995.59
2020-09-06KrieselManual testing279280191.2
2020-09-06KrieselManual testing280281382.4
2020-09-07KrieselManual testing281282764.7
2020-09-12KrieselManual testing2822831,529
2020-09-12KrieselManual testing2832843,059


ECM factoring results:
No ECM results for M640402457


Lucas-Lehmer results:
No L-L results for M640402457


PRP results:
No PRP results for M640402457


CERT results:
No CERT results for M640402457


P-1 factor-bounds graph:
B1 = 3600000, B2 = 128000000 (P-1 stage 2)
B1 = 3600000 (P-1 stage 1)
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109
TF factor-bounds graph:
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this exponent TF target: 83
TF double-checked to: 67
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JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00