is 2 72661609 - 1
has 21873324 decimal digits
takes 194.269 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-LCBC2F955914749__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275105.308864.0000%605000113437504.61363.5357%109.922465.2728%1.2728%
PrimeNet2703.288561.4286%320000140000004.13005.5361%7.418563.5639%2.1354%
GPU7227452.653263.5135%500000170000005.42344.1222%58.076665.0176%1.5040%
Difference+1+52.6556+0.4865%+105000-5656250-0.8098-0.5865%+51.8458+0.2553%+0.2553%

Known prime factors:
No known factors for M72661609

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-08-29T00:47:00PPed72Unimib60500011343750---4.614--3.536%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-05-25T00:00:00Jocelyn Larouchev4_computers21257--0.000--
2008-09-19T11:27:00Wojciech FlorekManual testing21264--0.049--
2010-05-21T13:32:00eon_blue_apocalypseFloppteron264265--0.051--
2010-05-22T21:07:00eon_blue_apocalypseFloppteron265266--0.103--
2010-05-26T01:01:00eon_blue_apocalypseFloppteron266267--0.206--
2010-05-29T18:02:00korvadualcore1267268--0.411--
2010-06-02T11:05:00korvadualcore1268269--0.823--
2012-11-21T08:41:00Robert_SoCalManual testing269270--1.645--
2013-04-19T11:16:00Houd Al-Obaidlidell_i7270271--3.291--
2015-03-12T01:20:001997rj7Manual testing271272--6.582--
2015-08-16T19:30:00Guido LorenziniManual testing272273--13.16--
2015-08-16T19:30:00Guido LorenziniManual testing273274--26.33--
2015-08-16T19:30:00Guido LorenziniManual testing274275--52.66--


ECM factoring results:
No ECM results for M72661609


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-10-07T19:15:16curtischum308--22lCBC2F955914749__194.3


PRP results:
No PRP results for M72661609


P-1 factor-bounds graph:
B1 = 605000, B2 = 11343750 (P-1 stage 2)
B1 = 605000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2015-10-07T19:15:16+00:00