is 2 25015561 - 1
has 7530435 decimal digits
takes 21.437 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC223E93678657C5Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27238.229665.2778%3700003700000.45981.4346%38.689365.7759%0.4981%
PrimeNet2660.590462.1212%11000040000000.40004.9779%0.990464.0068%1.8856%
GPU722709.552164.2857%18000050000000.55003.6606%10.102065.5931%1.3073%
Difference+2+28.6775+0.9921%+190000-4630000-0.0902-2.2260%+28.5873+0.1828%-0.8092%

Known prime factors:
No known factors for M25015561

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-07-13T00:00:00ANONYMOUSv4_computers370000370000---0.460--1.435%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2001-12-01T00:00:00Mattv4_computers21260--0.006--
2003-11-08T00:00:00markrv4_computers21262--0.025--
2004-04-29T00:00:00RMAC9.5v4_computers21267--1.188--
2006-05-12T00:00:00RMAC9.5v4_computers21267--1.188--
2015-12-18T11:19:22VictordeHollanderManual testing267268--1.195--
2017-04-26T20:46:46ramgeisManual testing268269--2.390--
2017-04-26T20:46:46ramgeisManual testing269270--4.780--
2021-05-29T18:50:20mikrManual testing270271--9.56--
2022-08-25T01:34:11Jon PaceManual testing271272--19.12--


ECM factoring results:
No ECM results for M25015561


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-07-26T00:00:00ANONYMOUSv4_computersC223E93678657C5C21.44
2011-03-12T20:20:00Emmanuel RoyerebenierC223E93678657C5C21.44


PRP results:
No PRP results for M25015561


P-1 factor-bounds graph:
B1 = 370000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-25T01:34:11+00:00