is 2 85583837 - 1
has 25763303 decimal digits
takes 275.651 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
Actual276178.818764.4737 %7800007800003.64281.5101 %182.461565.0102 %
Target27589.408364.0000 %5500009500000026.60103.9475 %116.009465.4211 %
Difference+1+89.4104+0.4737 %+230000-94220000-22.9583-2.4374 %+66.4521-0.4109 %

Known prime factors (1 factor, 88.2 bits, 0.00010308% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
855838373598802960130645902820386572788.2182102501527321476544
26 × 192 × 43 × 1973 × 3539 × 303091
2018-05-153539303091932,8430.09270.1440

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-05-15YxinityManual testing78000078000012788.2184.0971.693%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-27Architects Cubedm1_162642650.044
2013-03-04wangyun183Manual testing2652660.087
2013-03-05SMoffatManual testing2662680.524
2013-06-14PascalBieriManual testing2682690.699
2013-06-15PascalBieriManual testing2692701.397
2014-08-27HBendtzManual testing2702712.794
2017-02-28Judge HaleManual testing27127316.76
2017-04-19ANONYMOUSManual testing27327422.35
2017-09-21Brian BeuningManual testing27427544.71
2017-09-24TheJudgerManual testing27527689.41


ECM factoring results:
No ECM results for M85583837


Lucas-Lehmer results:
No L-L results for M85583837


PRP results:
No PRP results for M85583837


CERT results:
No CERT results for M85583837


P-1 factor-bounds graph:
B1 = 780000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
TF factor-bounds graph:
276
275
274
273
271
270
269
268
266
265
this exponent TF target: 75
TF double-checked to: 67
250
260
270
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290
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Last modified: 2024-03-13T02:15:48+00:00