is 2 1527607 - 1
has 459856 decimal digits
takes 0.068 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5F8E824BB4F2FF43double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.451368.6567%500000150000000.08354.9593%19.534870.2111%1.5544%
PrimeNet2570.012663.1579%65001100000.00082.4135%0.013464.0471%0.8892%
GPU722610.201165.5738%6500550000.00061.0138%0.201765.9228%0.3490%
Difference+6+19.2502+3.0829%+493500+14945000+0.0830+3.9455%+19.3332+4.2883%+4.2883%

Known prime factors (1 factor, 65.6 bits, 0.00429577% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1527607567985457555135400712065.62218590693076005
5 × 3718138615201
2013-08-20537181386152016.051813,12024,505

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000285000---0.002--0.985%
2011-01-30T21:51:00James HeinrichWHS800001340000---0.010--2.193%
2016-03-17T19:15:55alpertronManual testing5000001500000012---0.084--4.959%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-25T20:40:00Architects Cubeda3_bu2260261--0.101--
2010-05-04T02:59:00GrunwalderGIMPManual testing21263--1.045--
2011-05-07T06:36:00XyzzyManual testing263264--1.285--
2011-05-07T06:36:00XyzzyManual testing264265--2.446--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.897 GHz-days
Estimated T-Level:24.446
DigitsB1CurvesCompleteFacMiss
2011000249 / 1002.4908.188%
2550000249 / 2800.88941.030%

New Calculation Method

Total ECM effort:13.897 GHz-days
Estimated T-Level:24.446
DigitsB1CompleteFacMiss
20110008.0320.032%
25500000.72648.387%
302500000.04595.628%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024913.90


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00ANONYMOUSv4_computers5F8E824BB4F2FF430.068


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T14:24:10Oliver KruseGTX-0
56798545755513540071
3F23BED5386F5D__no
2017-10-30T00:54:59ATHec2-1xf
56798545755513540071
3F23BED5386F5D__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 285000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-06-07T09:14:59+00:00