is 2 25473221 - 1
has 7668204 decimal digits
takes 21.829 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF655DF709EC83DB6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275300.390366.6667%3800003800000.47221.0049%300.862567.0016%0.3350%
PrimeNet2660.579862.1212%12000045000000.44565.1688%1.025464.0791%1.9579%
GPU722709.380564.2857%18000055000000.58383.7421%9.964365.6222%1.3365%
Difference+5+291.0098+2.3810%+200000-5120000-0.1116-2.7371%+290.8982+1.3795%+1.3795%

Known prime factors:
No known factors for M25473221

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-11-22T00:00:00ANONYMOUSv4_computers380000380000---0.472--1.005%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-09-30T00:00:00Mattv4_computers21258--0.002--
2001-11-03T00:00:00Mattv4_computers21258--0.002--
2004-08-20T00:00:00ANONYMOUSv4_computers21267--1.166--
2011-09-16T11:26:00David CampeauManual testing267268--1.173--
2011-09-16T21:15:00David CampeauManual testing268269--2.347--
2011-09-20T11:58:00David CampeauManual testing269270--4.694--
2021-06-21T06:35:15mikrManual testing270271--9.387--
2021-08-28T19:12:00TheJudgerManual testing271272--18.77--
2021-08-28T19:12:00TheJudgerManual testing272273--37.55--
2021-09-30T20:07:19TheJudgerManual testing273274--75.10--
2021-10-19T16:34:24TheJudgerManual testing274275--150.2--


ECM factoring results:
No ECM results for M25473221


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-05-12T00:00:00S10747v4_computersF655DF709EC83DB621.83
2011-09-30T16:02:00David Campeaui5-2500kF655DF709EC83DB621.83


PRP results:
No PRP results for M25473221


P-1 factor-bounds graph:
B1 = 380000 (P-1 stage 1)
104
105
106
104
105
106
TF factor-bounds graph:
275
274
273
272
271
270
269
268
267
258
256
250
260
270
280
290
2100
Last modified: 2021-10-19T16:34:24+00:00