is 2 25983641 - 1
has 7821856 decimal digits
takes 22.267 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L560FC026C4BD068Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.399264.7887%31500070875000.84993.8627%19.249166.1488%1.3601%
PrimeNet2660.568462.1212%12000045000000.44565.1824%1.014064.0842%1.9630%
GPU722709.196264.2857%19000055000000.59563.7836%9.791865.6370%1.3513%
Difference+1+9.2030+0.5030%+125000+1587500+0.2543+0.0791%+9.4573+0.5118%+0.0088%

Known prime factors (1 factor, 67.1 bits, 0.00025815% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
259836411557187755614797789692167.0782996477198124
22 × 3 × 1321 × 189028337
2011-11-1713211890283371.284012.79923.901

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-10-18T00:00:00ANONYMOUSv4_computers3150007087500---0.850--3.863%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-11-17T00:16:00Carsten KossendeyManual testing??67.078210.14045.420.286
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2004-04-29T00:00:00ANONYMOUSv4_computers21262--0.024--
2004-09-02T00:00:00ANONYMOUSv4_computers21267--1.144--
2011-11-17T00:15:00Carsten KossendeyManual testing267271--17.26--


ECM factoring results:
No ECM results for M25983641


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-11-22T00:00:00ANONYMOUSv4_computers560FC026C4BD068B22.27


PRP results:
No PRP results for M25983641


P-1 factor-bounds graph:
B1 = 315000, B2 = 7087500 (P-1 stage 2)
B1 = 315000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
271
267
262
256
2
250
260
270
280
290
2100
Last modified: 2011-11-17T00:16:17+00:00