is 2 195592261 - 1
has 58879138 decimal digits
takes 1,600.053 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
Actual27419.560462.1622 %19550005816125059.51396.6234 %79.074364.6683 %
Target278312.980264.1026 %1200000225000000158.86804.2504 %471.848265.6284 %
Difference-4-293.4198-1.9404 %+755000-166838750-99.3541+2.3730%-392.7739-0.9600 %

Known prime factors (1 factor, 87.6 bits, 0.00004480% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1955922612395596041226357991459966812787.631612395405876093940
22 × 33 × 5 × 9161 × 17573 × 7044487
2019-05-26175737044487160,2464.74978.5030

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-05-26Mark Roseleonardo195500058161250622787.63159.514.697%


Trial Factoring results:
57585960616263646566676869707172737475767778
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-08-10EPFEPF_092632640.010
2011-04-21carlos562642650.019
2013-06-24Mucol2652660.038
2015-09-12sasakiubuntu2662670.076
2016-08-14ANONYMOUS2672680.153
2016-12-23La GüiraManual testing2682690.306
2016-12-23La GüiraManual testing2692700.611
2019-01-29Niels_Mache_NextcloudManual testing2702711.223
2019-03-27lobsterfordinnerManual testing2712722.445
2019-05-23arnaudstm-15-1602722734.890
2019-05-24arnaudstm-15-1602732749.78


ECM factoring results:
No ECM results for M195592261


Lucas-Lehmer results:
No L-L results for M195592261


PRP results:
No PRP results for M195592261


CERT results:
No CERT results for M195592261


P-1 factor-bounds graph:
B1 = 1955000, B2 = 58161250 (P-1 stage 2)
B1 = 1955000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 78
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00