is 2 1539983 - 1
has 463582 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L515D0BE098244819double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.295068.6567%100000002000000001.31819.7184%20.613171.7028%3.0461%
PrimeNet2570.012563.1579%65001100000.00082.4174%0.013364.0485%0.8906%
GPU722610.199565.5738%6500550000.00061.0157%0.200165.9234%0.3497%
Difference+6+19.0955+3.0829%+9993500+199945000+1.3175+8.7027%+20.4130+5.7793%+5.7793%

Known prime factors (1 factor, 89.4 bits, 0.00580278% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15399837954023701713232142020542972789.362258250373598709600756
22 × 19 × 569 × 5971935380600999
2015-12-115695971935380600999152,531,34521,072,96939,358,438

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2011-02-02T10:51:00James HeinrichWHS800001340000---0.010--2.196%
2013-11-22T18:09:00David Campeaui5-2500k94500027405000---0.155--5.944%
2015-03-20T13:59:00VictordeHollanderManual testing10000000200000000---1.318--9.718%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-28T13:20:00Architects Cubeda3_bu2260261--0.100--
2010-05-12T20:11:00GrunwalderGIMPManual testing21263--1.036--
2015-02-10T03:44:00snme2pm1Manual testing263264--1.275--
2015-02-10T03:44:00snme2pm1Manual testing264265--2.426--
2015-10-11T16:52:40ramgeisManual testing265266--4.852--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.807 GHz-days
DigitsB1CurvesCompleteFacMiss
2011000283 / 1002.8305.818%
2550000283 / 2801.01136.330%

New Calculation Method

Total ECM effort:15.807 GHz-days
DigitsB1CompleteFacMiss
20110009.1290.011%
25500000.82543.820%
302500000.05195.046%
3510000000.00299.768%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028015.64
50000500000030.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00ANONYMOUSv4_computers515D0BE0982448190.069
2015-07-21T00:18:00MadPooManual testing515D0BE0982448190.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:30:55alpertronManual testing
795402370171323214202054297
237E504FBF1794__no
2017-10-18T08:38:03Oliver KruseThreadripper
795402370171323214202054297
237E504FBF1794__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 945000, B2 = 27405000 (P-1 stage 2)
B1 = 945000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-10-18T08:38:03+00:00