is 2 8211479 - 1
has 2471902 decimal digits
takes 2.144 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L448FB9F5116FCEFCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.618665.6716%450007537500.03172.1993%3.650266.4266%0.7550%
PrimeNet2630.194463.4921%360009000000.03153.6206%0.225864.8139%1.3218%
GPU722673.618665.6716%5500013000000.04652.6270%3.665166.5735%0.9018%
Difference----10000-546250-0.0148-0.4278%-0.0148-0.1468%-0.1468%

Known prime factors (1 factor, 63.2 bits, 0.00076929% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8211479103796652476426550312063.170632021664285
32 × 5 × 11 × 23 × 55513541
2011-08-1123555135410.20291.14512.1388

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-03T00:00:00Team Prime Ribv4_computers45000697500---0.030--2.155%
2002-08-10T00:00:00Team Prime Ribv4_computers45000753750---0.032--2.199%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-08-11T05:14:00Carsten KossendeyManual testing??63.170200.0094.3620.017
1998-08-30T00:00:00ANONYMOUSv4_computers21262--0.075--
1999-05-09T00:00:00ANONYMOUSv4_computers21263--0.194--
1999-11-17T00:00:00ANONYMOUSv4_computers21263--0.194--
2011-08-11T05:13:00Carsten KossendeyManual testing263264--0.239--


ECM factoring results:
No ECM results for M8211479


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-01-12T00:00:00ANONYMOUSv4_computers448FB9F5116FCEFC2.144
2003-03-27T00:00:00Team Prime Ribv4_computers448FB9F5116FCEFC2.144


PRP results:
dateuseridcompidcofactorsres64PRP
2018-09-15T14:55:19Dylan Delgadodesktop
10379665247642655031
34CA469660CC33__no
2020-03-09T09:44:43marssystemssystem11
10379665247642655031
34CA469660CC3331no


P-1 factor-bounds graph:
B1 = 45000, B2 = 753750 (P-1 stage 2)
B1 = 45000, B2 = 697500 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
264
263
262
2
250
260
270
280
290
2100
Last modified: 2020-03-09T09:44:43+00:00