is 2 25399831 - 1
has 7646112 decimal digits
takes 21.766 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L48A0ADE9D0E63FB3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual275301.258266.6667%100000053045685037.08616.2839%338.344368.7613%
Target2709.407664.2857%18000055000000.58383.7406%9.991465.6216%
Difference+5+291.8507+2.3810%+820000+524956850+36.5022+2.5433%+328.3529+3.1396%

Known prime factors (1 factor, 139.4 bits, 0.00054902% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2539983195153371290264953385738933129262813708368742139.44918731103228652378314198022248506853
3 × 55337 × 81869 × 126517 × 246241 × 337759 × 130975729
2022-01-273377591309757296.287e+99.263716.561

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2006-12-18ANONYMOUSv4_computers3000006075000---0.764--2.426%
2008-03-22ANONYMOUSv4_computers380000380000---0.472--1.004%
2022-01-27Anton RepkoT5810100000053045685042139.44937.0943.5374.176.284%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12Net_Forcev4_computers21256--0.000--
2001-08-31Mattv4_computers21258--0.002--
2003-06-30ANONYMOUSv4_computers21260--0.006--
2004-02-14markrv4_computers21262--0.024--
2004-07-26ANONYMOUSv4_computers21267--1.170--
2016-01-15VictordeHollanderManual testing267268--1.177--
2017-05-29ramgeisManual testing268269--2.354--
2017-05-29ramgeisManual testing269270--4.707--
2021-06-16mikrManual testing270271--9.415--
2021-08-28TheJudgerManual testing271272--18.83--
2021-08-28TheJudgerManual testing272273--37.66--
2021-09-30TheJudgerManual testing273274--75.32--
2021-10-17TheJudgerManual testing274275--150.6--


ECM factoring results:
No ECM results for M25399831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2007-01-16ANONYMOUSv4_computers48A0ADE9D0E63FB321.77
2010-11-23akhayyatlondon48A0ADE9D0E63FB321.77


PRP results:
dateuseridcompidcofactorsres64PRP
2023-01-28DobriManual testing
951533712902649533857389331292628137083687
95576E1C0A714038no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 530456850 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 300000, B2 = 6075000 (P-1 stage 2)
B1 = 380000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2023-01-28T04:28:00+00:00