is 2 147836281 - 1
has 44503156 decimal digits
takes 847.749 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 PRP tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP5425AE10FB5F3095PRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27312.938961.6438 %4000000400000033.25943.9990 %46.198363.1777 %
Target277207.041063.6364 %90000017000000084.08834.1400 %291.129365.1418 %
Difference-4-194.1020-1.9925 %+3100000-166000000-50.8289-0.1409 %-244.9309-1.9641 %

Known prime factors (1 factor, 132.6 bits, 0.00008973% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
147836281854079862666497553838494731559955253160140132.65028886003384598722212123786161800
23 × 52 × 491 × 2399 × 326701 × 411637 × 617809 × 1475797
2020-07-176178091475797868,397,7375.525710.455

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2020-07-17Roland ClarksonManual testing40000004000000140132.65033.832.730%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-01-06Richardsvn_022642650.025
2013-01-03CreweNetHome2652660.051
2015-03-09aurashiftusslcburnin062662670.101
2016-03-17DerekManual testing2672680.202
2016-06-04DerekManual testing2682690.404
2016-06-08bastrogueManual testing2692700.809
2016-06-28bastrogueManual testing2702711.618
2016-09-10bastrogueManual testing2712723.235
2016-10-03John BurroughsManual testing2722736.470


ECM factoring results:
No ECM results for M147836281


Lucas-Lehmer results:
No L-L results for M147836281


PRP results:
dateuseridcompidcofactorsres64
2019-11-11Roland ClarksonManual testing5425AE10FB5F3095


CERT results:
No CERT results for M147836281


P-1 factor-bounds graph:
B1 = 4000000 (P-1 stage 1)
104
105
106
107
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
this exponent TF target: 77
TF double-checked to: 67
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JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00