is 2 74864953 - 1
has 22536597 decimal digits
takes 206.979 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
Actual275102.209564.0000 %6250006250002.50551.5076 %104.715064.5428 %
Target27451.103663.5135 %5000008500000020.46024.1374 %71.563765.0231 %
Difference+1+51.1059+0.4865 %+125000-84375000-17.9546-2.6297 %+33.1513-0.4803 %

Known prime factors (1 factor, 87.3 bits, 0.00011655% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
748649531849263492211510995855272392787.2571235066221314204923
7 × 251 × 6101 × 250919 × 459181
2016-06-20250919459181665,4151.05142.0472

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-06-20Jimmy BrüggemanniMac462500062500012787.2572.5551.693%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-03-10Jossv4_computers212570.000
2016-04-02Mark RoseManual testing257264
2010-07-13GrunwalderGIMPcompute-0-52642650.050
2010-07-14lindedDCL51NG12652660.100
2010-07-16sasaki3Mail_Saver2662670.200
2010-07-20David Barleyscrappy2672680.399
2010-07-23MillsieHome2682690.799
2012-10-26ANONYMOUS2692701.597
2014-08-10Vladimir Tshegolevatykhtroy2702713.194
2015-08-31FredrikManual testing2712726.388
2015-12-06TheJudgerManual testing27227589.44


ECM factoring results:
No ECM results for M74864953


Lucas-Lehmer results:
No L-L results for M74864953


PRP results:
No PRP results for M74864953


CERT results:
No CERT results for M74864953


P-1 factor-bounds graph:
B1 = 625000 (P-1 stage 1)
104
105
106
104
105
106
TF factor-bounds graph:
275
272
271
270
269
268
267
266
265
264
257
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00