is 2 91601557 - 1
has 27574817 decimal digits
takes 331.801 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRPB62B72D0B98868__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual277334.144664.9351%700000133000007.28213.1472%341.426766.0386%1.1036%
PrimeNet2715.219161.9718%400000180000007.13725.5559%12.356364.0846%2.1128%
GPU7227583.534764.0000%600000220000009.27514.1389%92.809865.4900%1.4900%
Difference+2+250.6099+0.9351%+100000-8700000-1.9929-0.9918%+248.6169+0.5486%+0.5486%

Known prime factors:
No known factors for M91601557

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-06-15T14:25:18David HruskaDesktopIIc700000133000006---7.282--3.147%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-01-03T22:20:00Architects Cubedm1_sa264265--0.041--
2013-06-18T01:19:00David CampeauManual testing265266--0.082--
2014-02-06T16:08:00ANONYMOUS266267--0.163--
2014-02-07T03:32:00Todd WalkeBigBlackIvy267268--0.326--
2014-04-08T05:07:00hkskypManual testing268269--0.653--
2014-04-08T05:36:00hkskypManual testing269270--1.305--
2014-09-07T19:56:00SMoffatManual testing270271--2.611--
2017-10-30T16:00:19Strolling JellyfishManual testing271272--5.221--
2017-10-30T16:00:19Strolling JellyfishManual testing272273--10.44--
2017-10-30T16:00:19Strolling JellyfishManual testing273274--20.88--
2017-10-30T16:00:19Strolling JellyfishManual testing274275--41.77--
2017-10-30T16:00:19Strolling JellyfishManual testing275276--83.54--
2019-03-24T07:51:27TravisJankManual testing276277--167.1--


ECM factoring results:
No ECM results for M91601557


Lucas-Lehmer results:
No L-L results for M91601557


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-09T18:04:17Ben Deloi-0e8fe73ce00a354b4B62B72D0B98868__no


P-1 factor-bounds graph:
B1 = 700000, B2 = 13300000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-01-09T18:04:17+00:00