is 2 25308161 - 1
has 7618516 decimal digits
takes 21.688 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC8545CE2518F187Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275302.349466.6667%30000073500000.85002.5293%303.199567.5098%0.8431%
PrimeNet2660.583562.1212%11000040000000.40004.9857%0.983664.0097%1.8885%
GPU722709.441664.2857%18000055000000.58383.7388%10.025565.6210%1.3353%
Difference+5+292.9078+2.3810%+120000+1850000+0.2662-1.2095%+293.1740+1.8888%+1.8888%

Known prime factors (1 factor, 90.8 bits, 0.00035877% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2530816121521956900073168146780765032890.79842519796084893659691
3 × 441799 × 743321 × 43158743		2021-12-257433214315874316,193,1623.79515.4571

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-08-06T00:00:00ANONYMOUSv4_computers3000007350000---0.850--2.529%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-12-25T00:14:36Anton RepkoDeskMini200000012000000027P-12890.79811.61


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2004-01-18T00:00:00markrv4_computers21262--0.024--
2004-04-29T00:00:00ANONYMOUSv4_computers21267--1.174--
2016-01-04T21:26:37VictordeHollanderManual testing267268--1.181--
2017-05-29T00:27:30ramgeisManual testing268269--2.362--
2017-05-29T00:27:30ramgeisManual testing269270--4.724--
2021-06-10T08:58:33mikrManual testing270271--9.449--
2021-08-28T19:07:55TheJudgerManual testing271272--18.90--
2021-08-28T19:07:55TheJudgerManual testing272273--37.79--
2021-10-01T20:08:16TheJudgerManual testing273274--75.59--
2021-10-17T21:12:39TheJudgerManual testing274275--151.2--


ECM factoring results:
No ECM results for M25308161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-10-18T00:00:00ANONYMOUSv4_computersC8545CE2518F187E21.69
2010-09-23T20:16:00Antonio MolinaHomeC8545CE2518F187E21.69


PRP results:
No PRP results for M25308161


P-1 factor-bounds graph:
B1 = 2000000, B2 = 120000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 300000, B2 = 7350000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
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TF factor-bounds graph:
275
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2100
Last modified: 2021-12-25T00:14:36+00:00