is 2 91221721 - 1
has 27460475 decimal digits
takes 330.425 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
Actual277335.535964.9351%695000132050007.23013.1378%342.766066.0353%1.1003%
PrimeNet2715.240861.9718%400000180000007.13725.5531%12.378164.0836%2.1118%
GPU7227583.882564.0000%600000220000009.27514.1368%93.157665.4893%1.4893%
Difference+2+251.6534+0.9351%+95000-8795000-2.0450-0.9990%+249.6084+0.5461%+0.5461%

Known prime factors:
No known factors for M91221721

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-04-26T06:41:07ixfd64libra695000132050006---7.230--3.138%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-12-29T01:30:00Architects Cubedm1_78264265--0.041--
2013-03-24T09:30:00AxelssonManual testing265266--0.082--
2014-04-05T00:32:00SMoffatManual testing266267--0.164--
2014-04-05T06:15:00hkskypManual testing267268--0.328--
2014-04-05T06:30:00hkskypManual testing268269--0.655--
2014-04-05T06:59:00hkskypManual testing269270--1.311--
2014-09-04T07:08:00Templarfdesk2270271--2.621--
2017-03-02T17:24:34monstManual testing271272--5.243--
2018-02-17T18:31:49RichD0Manual testing272273--10.49--
2018-02-20T02:18:33gcardonaManual testing273274--20.97--
2018-12-16T22:35:29TheJudgerManual testing274275--41.94--
2018-12-16T22:35:29TheJudgerManual testing275276--83.88--
2019-03-03T17:40:53TheJudgerManual testing276277--167.8--


ECM factoring results:
No ECM results for M91221721


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2019-07-12T04:13:04Tomas Velechovskyb_bkp97149F9AE7CEBC__330.4


PRP results:
No PRP results for M91221721


P-1 factor-bounds graph:
B1 = 695000, B2 = 13205000 (P-1 stage 2)
B1 = 695000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-07-12T04:13:04+00:00