is 2 15525893 - 1
has 4673760 decimal digits
takes 7.787 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE28B9C8D47F451BBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274246.418467.5676%150000074112843030.39547.1539%276.813869.8877%2.3202%
PrimeNet2650.469963.0769%7000022000000.13534.2998%0.605264.6646%1.5876%
GPU722697.689565.2174%11000028000000.18663.1114%7.876166.2996%1.0822%
Difference+5+238.7289+2.3502%+1390000+738328430+30.2088+4.0424%+268.9377+3.5881%+1.2379%

Known prime factors (1 factor, 131.2 bits, 0.00084512% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15525893315310401519655891021240323976957724578340131.212101543402856008311734867786341487
32 × 53 × 193 × 2999 × 19553 × 476831 × 513269 × 76855799		2022-04-09513269768557998.669e+93.39805.6874

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-05-11T00:00:00curtiscv4_computers235000235000---0.171--0.816%
2016-05-09T16:14:42ThaManual testing300000600000012---0.444--2.518%
2022-04-09T03:50:30Sid & AndySpeck150000074112843040131.21230.4015.5760.797.154%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-21T00:00:00Net_Forcev4_computers21258--0.002--
2001-02-11T00:00:00Net_Forcev4_computers21259--0.005--
2001-03-18T00:00:00dlsilverv4_computers21265--0.470--
2013-10-07T20:33:00David CampeauManual testing265266--0.481--
2013-12-28T00:10:00NesowaManual testing266267--0.963--
2018-03-23T21:42:43ramgeisManual testing267268--1.925--
2018-03-23T21:42:43ramgeisManual testing268269--3.850--
2021-06-03T18:20:08lycornManual testing269270--7.701--
2021-09-08T15:07:59SRBaseManual testing270271--15.40--
2021-09-14T10:42:33-Anonymous-Manual testing271272--30.80--
2022-01-21T20:16:31Anton RepkoManual testing272274--184.8--


ECM factoring results:
Total ECM effort:0.763 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-03T00:00:00curtiscv4_computersE28B9C8D47F451BB7.787
2005-12-12T00:00:00ANONYMOUSv4_computersE28B9C8D47F451BB7.787


PRP results:
No PRP results for M15525893


P-1 factor-bounds graph:
B1 = 1500000, B2 = 741128430 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 235000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-09T03:50:30+00:00