is 2 51641771 - 1
has 15545723 decimal digits
takes 98.932 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2670.575461.1940 %----0.575461.1940 %
Target27337.040664.3836 %340000550000009.21693.8018 %46.257565.7376 %
Difference-6-36.4653-3.1895 %-340000-55000000-9.2169-3.8018 %-45.6822-4.5436 %

Known prime factors (1 factor, 67.8 bits, 0.00013127% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
516417712548653539445945390492167.7882467627939644
22 × 3 × 7 × 29376523091
2008-12-097293765230910.95424,445.98,303.8

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2008-12-09CaptainEntropyv4_computers2167.7883.1260.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-12-09CaptainEntropyv4_computers??
67.788
21
2000-01-04ANONYMOUSv4_computers212532.32000e-5
2000-02-16ANONYMOUSv4_computers212544.65000e-5
2000-04-27ANONYMOUSv4_computers212560.000
2001-05-20ANONYMOUSv4_computers212570.000
2002-03-03ANONYMOUSv4_computers212580.001
2003-11-28apocalypsev4_computers212600.001
2022-04-05LordJuliusManual testing260263
2008-11-30Stefan MuthCore_2_Duo2632640.038


ECM factoring results:
No ECM results for M51641771


Lucas-Lehmer results:
No L-L results for M51641771


PRP results:
No PRP results for M51641771


CERT results:
No CERT results for M51641771


P-1 factor-bounds graph:
100
101
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
264
263
260
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00