is 2 87921143 - 1
has 26466902 decimal digits
takes 296.408 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual276174.065064.4737%7050007050003.44631.4503%177.511364.9889%0.5152%
PrimeNet2715.437661.9718%360000170000006.19165.4031%11.629264.0265%2.0547%
GPU7227587.031564.0000%600000200000008.09994.0456%95.131465.4564%1.4564%
Difference+1+87.0335+0.4737%+105000-19295000-4.6536-2.5953%+82.3799-0.4675%-0.4675%

Known prime factors (1 factor, 97.9 bits, 0.00011132% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
879211432900325814827957012924606390013097.8721649390417290160236500
22 × 3 × 53 × 73 × 449 × 457 × 653 × 947 × 118709
2018-06-13947118709568,901,2870.03600.0590

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2018-06-13T06:17:11mikrS0567050007050003097.8723.446592.86.8931.450%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-11-19T21:20:00Architects Cubedm1_08264265--0.042--
2013-03-08T04:46:00Freaks32Manual testing265266--0.085--
2013-03-19T07:42:00jondi_hanlucManual testing266267--0.170--
2013-03-19T07:42:00jondi_hanlucManual testing267268--0.340--
2013-03-19T07:42:00jondi_hanlucManual testing268269--0.680--
2013-03-19T07:42:00jondi_hanlucManual testing269270--1.360--
2013-03-19T07:42:00jondi_hanlucManual testing270271--2.720--
2013-03-19T07:42:00jondi_hanlucManual testing271272--5.440--
2013-03-19T07:42:00jondi_hanlucManual testing272273--10.88--
2017-06-12T12:51:17ANONYMOUSManual testing273274--21.76--
2018-04-25T16:00:07Strolling JellyfishManual testing274275--43.52--
2018-04-25T16:00:07Strolling JellyfishManual testing275276--87.03--


ECM factoring results:
No ECM results for M87921143


Lucas-Lehmer results:
No L-L results for M87921143


PRP results:
No PRP results for M87921143


P-1 factor-bounds graph:
B1 = 705000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-06-13T06:17:11+00:00