is 2 91556779 - 1
has 27561337 decimal digits
takes 331.639 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual277334.308064.9351%700000127750007.13193.1203%341.439966.0292%1.0941%
PrimeNet2715.221761.9718%400000180000007.13725.5555%12.358964.0845%2.1127%
GPU7227583.575664.0000%600000220000009.27514.1387%92.850665.4899%1.4899%
Difference+2+250.7325+0.9351%+100000-9225000-2.1432-1.0184%+248.5893+0.5393%+0.5393%

Known prime factors:
No known factors for M91556779

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-06-02T02:52:54Chang Chia-Tcheex-ctcpc70000012775000---7.132--3.120%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-01-03T18:20:00Architects Cubeda3_bu2264265--0.041--
2013-06-17T11:17:00David CampeauManual testing265266--0.082--
2014-06-03T01:11:00SMoffatManual testing266267--0.163--
2014-06-08T10:33:00Alex HenrieManual testing267268--0.326--
2014-06-11T07:51:00Alex HenrieManual testing268269--0.653--
2014-06-17T10:19:00ANONYMOUS269270--1.306--
2014-09-05T17:45:00shaugeManual testing270271--2.612--
2017-03-28T22:05:48monstManual testing271272--5.224--
2018-06-07T09:00:13Andrew LuebkeManual testing272273--10.45--
2018-06-20T09:00:04Tim SorberaManual testing273274--20.89--
2019-01-02T16:10:04Strolling JellyfishManual testing274275--41.79--
2019-01-02T16:10:04Strolling JellyfishManual testing275276--83.58--
2019-03-21T17:40:05Jon PaceManual testing276277--167.2--


ECM factoring results:
No ECM results for M91556779


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2019-09-17T22:54:10Chun sung sooAMD6BDD8E197BED0B__331.6


PRP results:
No PRP results for M91556779


P-1 factor-bounds graph:
B1 = 700000, B2 = 12775000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
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108
TF factor-bounds graph:
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Last modified: 2019-09-17T22:54:10+00:00