is 2 87222197 - 1
has 26256498 decimal digits
takes 280.928 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF26C23F7DC0089E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual276175.459964.4737 %705000135712506.56633.4687 %182.026165.7060 %
Target27587.728964.0000 %55000010000000027.87333.9951 %115.602265.4382 %
Difference+1+87.7309+0.4737 %+155000-86428750-21.3070-0.5264 %+66.4240+0.2678 %

Known prime factors:
No known factors for M87222197

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2018-07-09vats09C2Q6600705000135712506--6.5663.822%


Trial Factoring results:
5758596061626364656667686970717273747576
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2010-11-16Architects Cubedm1_432642650.043
2013-03-05AxelssonManual testing2652660.086
2013-06-21PascalBieriManual testing2662670.171
2013-06-22PascalBieriManual testing2672680.343
2013-06-24PascalBieriManual testing2682690.685
2013-07-22SMoffatManual testing2692701.371
2013-08-16PEDManual testing2702712.742
2017-05-15Judge HaleManual testing27127316.45
2017-06-12ANONYMOUSManual testing27327421.93
2018-05-21RichD0Manual testing27427543.87
2018-05-25Jon PaceManual testing27527687.73


ECM factoring results:
No ECM results for M87222197


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2018-10-25HiNorthstarF26C23F7DC0089E8280.9
2018-12-29ANONYMOUS0C7963B712297863280.9
2019-05-27kkmrkkblmbrbkc5.4xlargeF26C23F7DC0089E8280.9


PRP results:
No PRP results for M87222197


CERT results:
No CERT results for M87222197


P-1 factor-bounds graph:
B1 = 705000, B2 = 13571250 (P-1 stage 2)
B1 = 705000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
276
275
274
273
271
270
269
268
267
266
265
this exponent TF target: 75
TF double-checked to: 67
250
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280
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Last modified: 2024-03-13T02:15:48+00:00