is 2 25560607 - 1
has 7694510 decimal digits
takes 21.904 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L6418CECB2F951279double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27118.703764.7887 %1200000792000006.77166.9282 %25.475367.2283 %
Target2709.348464.2857 %180000275000002.07323.7438 %11.421665.6228 %
Difference+1+9.3553+0.5030 %+1020000+51700000+4.6984+3.1844%+14.0537+1.6055 %

Known prime factors (1 factor, 88.5 bits, 0.00034627% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
255606074401661107224169661836005532788.5088610243698876497068
22 × 3 × 163 × 251 × 787 × 5653 × 3942023
2021-08-16565339420232,700,8700.27350.4984

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2005-05-28ANONYMOUSv4_computers2550001912500--0.4293.088%
2021-08-16Dylan Delgadolaptop-ryzen7370012000007920000022788.5086.7727.546%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-08-12Net_Forcev4_computers212560.000
2002-02-17Mattv4_computers212570.001
2004-05-15Marzbugv4_computers212670.585
2016-01-30VictordeHollanderManual testing2672681.169
2017-06-09ramgeisManual testing2682707.016
2021-06-26mikrManual testing2702719.355


ECM factoring results:
No ECM results for M25560607


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2006-01-15ANONYMOUSv4_computers6418CECB2F95127921.90
2010-10-13pntidev.pnti.pl6418CECB2F95127925.42


PRP results:
No PRP results for M25560607


CERT results:
No CERT results for M25560607


P-1 factor-bounds graph:
B1 = 1200000, B2 = 79200000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 255000, B2 = 1912500 (P-1 stage 2)
B1 = 255000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
271
270
268
267
257
256
this exponent TF target: 70
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00