is 2 90871577 - 1
has 27355071 decimal digits
takes 329.157 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
Actual277336.828864.9351 %740000170200008.54533.3326 %345.374166.1037 %
Target27584.205764.0000 %60000010000000031.59524.0619 %115.800965.4623 %
Difference+2+252.6231+0.9351 %+140000-82980000-23.0499-0.7292 %+229.5731+0.6414 %

Known prime factors (1 factor, 84.3 bits, 0.00009281% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
90871577243909863920259582377010172684.335134205805584434604
22 × 3 × 532 × 410701 × 9694213
2019-03-20410701969421366,2954.81365.1812

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-03-20RuzovejManual testing74000017020000422684.3358.5454.042%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-07-22Carsten Kossendeymother2642650.041
2010-08-18Carsten KossendeyManual testing2652660.082
2010-12-06Carsten KossendeyManual testing2662670.164
2011-01-04Carsten KossendeyManual testing2672680.329
2011-06-22Carsten KossendeyManual testing2682690.658
2014-04-05Preben SManual testing2692701.316
2014-09-06SMoffatManual testing2702712.631
2016-04-22Carsten KossendeyManual testing2712725.263
2017-08-01Carsten KossendeyManual testing27227310.53
2018-12-09TheJudgerManual testing273276147.4
2019-01-20TheJudgerManual testing276277168.4


ECM factoring results:
No ECM results for M90871577


Lucas-Lehmer results:
No L-L results for M90871577


PRP results:
No PRP results for M90871577


CERT results:
No CERT results for M90871577


P-1 factor-bounds graph:
B1 = 740000, B2 = 17020000 (P-1 stage 2)
B1 = 740000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
277
276
273
272
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
260
270
280
290
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00