is 2 1541513 - 1
has 464042 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-L469984A011AB6634double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.275868.6567%500000150000000.08354.9647%19.359470.2128%1.5561%
PrimeNet2570.012563.1579%65001100000.00082.4178%0.013264.0487%0.8908%
GPU722610.199365.5738%6500550000.00061.0159%0.199965.9235%0.3497%
Difference+6+19.0765+3.0829%+493500+14945000+0.0830+3.9489%+19.1595+4.2893%+4.2893%

Known prime factors (1 factor, 66.5 bits, 0.00431107% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15415131011955932009298677532166.45632823464090452
22 × 7 × 18043 × 64970713
2013-09-1318043649707139.8160.23040.4282

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2011-02-02T19:45:00James HeinrichWHS800001340000---0.010--2.196%
2016-03-17T19:16:07alpertronManual testing5000001500000012---0.084--4.965%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00S00030v4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-27T13:20:00Architects Cubeda3_bu2260261--0.100--
2010-05-17T00:58:00GrunwalderGIMPManual testing21263--1.035--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.965 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:13.965 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.0650.031%
25500000.72948.246%
302500000.04595.611%
3510000000.00299.795%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025013.97


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00S00030v4_computers469984A011AB66340.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T16:57:19Oliver KruseGTX-1
101195593200929867753
3F47767AB8A246__no
2017-11-10T15:02:17kkmrkkblmbrbkc4.xlarge
101195593200929867753
3F47767AB8A246__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 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-07-19T09:15:37+00:00