is 2 25645663 - 1
has 7720114 decimal digits
takes 21.977 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8847751154EA8ED3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.641764.7887%30000068250000.81453.8009%19.456266.1271%1.3383%
PrimeNet2660.575962.1212%12000045000000.44565.1734%1.021564.0809%1.9596%
GPU722709.317464.2857%18000055000000.58383.7455%9.901265.6234%1.3377%
Difference+1+9.3243+0.5030%+120000+1325000+0.2307+0.0554%+9.5550+0.5037%+0.5037%

Known prime factors (1 factor, 67.5 bits, 0.00026313% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
256456632058538838699193904812167.4804013424879480
23 × 32 × 5 × 172 × 38575787
2011-10-24289385757872.17282.61194.8776

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-12-13T00:00:00Prime Hunterv4_computers3000006825000---0.815--3.801%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-10-24T18:08:00Carsten KossendeyManual testing??67.480211.01444.782.066
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2004-04-29T00:00:00ANONYMOUSv4_computers21262--0.024--
2004-06-04T00:00:00ANONYMOUSv4_computers21267--1.159--
2011-10-24T18:08:00Carsten KossendeyManual testing267271--17.48--


ECM factoring results:
No ECM results for M25645663


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-01-10T00:00:00Prime Hunterv4_computers8847751154EA8ED321.98


PRP results:
No PRP results for M25645663


P-1 factor-bounds graph:
B1 = 300000, B2 = 6825000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
271
267
262
256
2
250
260
270
280
290
2100
Last modified: 2011-10-24T18:08:07+00:00