is 2 91216357 - 1
has 27458860 decimal digits
takes 330.406 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-
PRP929EFCBEC55183__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual277335.555764.9351%700000129500007.18203.1279%342.737666.0318%1.0968%
PrimeNet2715.241161.9718%400000180000007.13725.5531%12.378464.0836%2.1117%
GPU7227583.887564.0000%600000220000009.27514.1368%93.162565.4893%1.4893%
Difference+2+251.6682+0.9351%+100000-9050000-2.0931-1.0090%+249.5751+0.5426%+0.5426%

Known prime factors:
No known factors for M91216357

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-04-21T05:24:03ixfd64dchia-mobl700000129500006---7.182--3.128%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-12-29T01:20:00Architects Cubedm1_64264265--0.041--
2012-04-05T00:59:00c10ck3rManual testing265266--0.082--
2013-08-29T12:16:00Norman LeyManual testing266267--0.164--
2013-11-21T16:31:00Martin Wiegand267268--0.328--
2014-04-01T01:51:00hkskypManual testing268269--0.655--
2014-04-05T12:10:00evatutinvtdc269270--1.311--
2014-09-07T22:49:00Nesowacarparts270271--2.622--
2017-03-01T06:39:30monstManual testing271272--5.243--
2018-02-13T05:08:43gcardonaManual testing272273--10.49--
2018-02-13T05:08:43gcardonaManual testing273274--20.97--
2018-12-16T22:35:05TheJudgerManual testing274275--41.94--
2018-12-16T22:35:05TheJudgerManual testing275276--83.89--
2019-03-03T17:40:48TheJudgerManual testing276277--167.8--


ECM factoring results:
No ECM results for M91216357


Lucas-Lehmer results:
No L-L results for M91216357


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-29T00:31:15George WoltmanManual testing929EFCBEC55183__no


P-1 factor-bounds graph:
B1 = 700000, B2 = 12950000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-02-29T00:31:15+00:00