is 2 25208551 - 1
has 7588530 decimal digits
takes 21.602 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L885091A99D67746Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27375.880865.7534%26000027300000.49032.4370%76.371166.5880%0.8346%
PrimeNet2660.585962.1212%11000040000000.40004.9831%0.985964.0087%1.8875%
GPU722709.479064.2857%18000055000000.58383.7368%10.062865.6203%1.3346%
Difference+3+66.4018+1.4677%+80000-2770000-0.0935-1.2998%+66.3083+0.9677%+0.9677%

Known prime factors:
No known factors for M25208551

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-10-03T00:00:00curtiscv4_computers2600002730000---0.490--2.437%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2003-12-31T00:00:00markrv4_computers21262--0.024--
2004-05-11T00:00:00Richard Kintv4_computers21267--1.179--
2007-03-20T00:00:00Richard Kintv4_computers21267--1.179--
2008-03-03T00:00:00Richard Kintv4_computers21267--1.179--
2016-01-04T21:26:09VictordeHollanderManual testing267268--1.186--
2017-06-13T14:54:08ramgeisManual testing268269--2.371--
2017-06-13T14:54:08ramgeisManual testing269270--4.743--
2021-01-08T11:21:40-Anonymous-Manual testing270271--9.486--
2021-01-08T11:21:40-Anonymous-Manual testing271272--18.97--
2021-01-09T19:05:24-Anonymous-Manual testing272273--37.94--


ECM factoring results:
No ECM results for M25208551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-10-03T00:00:00curtiscv4_computers885091A99D67746A21.60
2011-05-05T04:48:00curtisccsc143-20l885091A99D67746A21.60
2015-03-30T14:25:00MadPooManual testing885091A99D67746A21.60


PRP results:
No PRP results for M25208551


P-1 factor-bounds graph:
B1 = 260000, B2 = 2730000 (P-1 stage 2)
B1 = 260000 (P-1 stage 1)
104
105
106
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
262
258
256
250
260
270
280
290
2100
Last modified: 2021-01-09T19:05:24+00:00