is 2 91216261 - 1
has 27458831 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-
PRP51B962EA3DDFBF__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual277335.556064.9351%700000131250007.23203.1367%342.788166.0350%1.0999%
PrimeNet2715.241261.9718%400000180000007.13725.5531%12.378464.0836%2.1117%
GPU7227583.887564.0000%600000220000009.27514.1368%93.162665.4893%1.4893%
Difference+2+251.6685+0.9351%+100000-8875000-2.0430-1.0001%+249.6254+0.5457%+0.5457%

Known prime factors:
No known factors for M91216261

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-04-19T09:12:06BattlemaxxWork-4700000131250006---7.232--3.137%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-12-29T02:40:00Architects Cubedm1_26264265--0.041--
2012-04-05T00:59:00c10ck3rManual testing265266--0.082--
2014-04-03T02:16:00SMoffatManual testing266267--0.164--
2014-11-07T20:53:00monstManual testing267268--0.328--
2014-11-18T11:38:00monstManual testing268269--0.655--
2014-11-29T17:52:00shaugeManual testing269270--1.311--
2014-11-29T17:52:00shaugeManual testing270271--2.622--
2017-03-01T06:39:30monstManual testing271272--5.243--
2018-02-13T02:08:35gcardonaManual testing272273--10.49--
2018-02-13T02:08:35gcardonaManual testing273274--20.97--
2018-12-16T22:35:01TheJudgerManual testing274275--41.94--
2018-12-16T22:35:01TheJudgerManual testing275276--83.89--
2019-03-03T17:40:43TheJudgerManual testing276277--167.8--


ECM factoring results:
No ECM results for M91216261


Lucas-Lehmer results:
No L-L results for M91216261


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-28T06:31:03George WoltmanManual testing51B962EA3DDFBF__no


P-1 factor-bounds graph:
B1 = 700000, B2 = 13125000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-02-28T06:31:03+00:00