is 2 90811531 - 1
has 27336995 decimal digits
takes 328.940 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
Actual277337.051564.9351 %6950006950003.65031.2885 %340.701865.3869 %
Target27584.261464.0000 %60000010000000031.59524.0615 %115.856665.4622 %
Difference+2+252.7901+0.9351 %+95000-99305000-27.9449-2.7730 %+224.8452-0.0753 %

Known prime factors (1 factor, 82.1 bits, 0.00009040% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
9081153151761258246302302653634012582.09828499276290310700
22 × 3 × 52 × 7 × 17 × 1973 × 9907 × 40841
2019-04-0199074084113,7270.06090.1059

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-04-01James Heinrich3930K69500069500012582.0983.3971.626%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-05-13Carsten Kossendeymother2642650.041
2010-08-11Carsten KossendeyManual testing2652660.082
2010-12-05Carsten KossendeyManual testing2662670.165
2010-12-23Carsten KossendeyManual testing2672680.329
2011-06-24Carsten KossendeyManual testing2682690.658
2014-04-11hkskypManual testing2692701.317
2014-11-19shaugeManual testing2702712.633
2016-04-08Carsten KossendeyManual testing2712725.266
2017-07-06Carsten KossendeyManual testing27227310.53
2018-12-09TheJudgerManual testing273276147.5
2019-01-20TheJudgerManual testing276277168.5


ECM factoring results:
No ECM results for M90811531


Lucas-Lehmer results:
No L-L results for M90811531


PRP results:
No PRP results for M90811531


CERT results:
No CERT results for M90811531


P-1 factor-bounds graph:
B1 = 695000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
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
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Last modified: 2024-03-13T02:15:48+00:00