is 2 74207281 - 1
has 22338618 decimal digits
takes 205.161 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
Verified Mersenne Prime

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275103.115364.0000%640000126400005.18663.6504%108.301965.3142%1.3142%
PrimeNet2703.220061.4286%320000140000004.27075.5503%7.490763.5694%2.1408%
GPU7227451.556563.5135%500000170000005.60824.1329%57.164765.0215%1.5079%
Difference+1+51.5589+0.4865%+140000-4360000-0.4216-0.4825%+51.1372+0.2927%+0.2927%

Known prime factors:
None — M74207281 is prime!

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-06-14T16:51:00TheJudgerManual testing64000012640000---5.187--3.650%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-12T23:28:00lycornManual testing21264--0.048--
2010-08-25T06:45:00PalantsevichOffice55264265--0.050--
2010-08-27T17:10:00fswebfs75broad2265266--0.101--
2010-08-31T06:21:00ANONYMOUSdownstairs266267--0.201--
2010-09-01T07:52:00GrunwalderGIMPcompute-0-3267268--0.403--
2011-01-04T23:44:00SADMASTERManual testing268269--0.806--
2016-10-14T13:14:01SADMASTERManual testing268269--0.806--
2012-10-23T20:58:00Clown_RoyalManual testing269270--1.611--
2013-05-10T00:51:00SMoffatManual testing270271--3.222--
2015-06-07T02:48:00kdgehmanManual testing271272--6.445--
2015-06-07T02:48:00kdgehmanManual testing272273--12.89--
2015-06-07T10:55:00kdgehmanManual testing273274--25.78--
2015-06-07T10:55:00kdgehmanManual testing274275--51.56--


ECM factoring results:
No ECM results for M74207281


Lucas-Lehmer results:
No L-L results for M74207281


PRP results:
No PRP results for M74207281


P-1 factor-bounds graph:
B1 = 640000, B2 = 12640000 (P-1 stage 2)
B1 = 640000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2016-10-14T13:14:01+00:00