is 2 1538093 - 1
has 463013 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-LBFCF6FC8D0DD96E7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.318768.6567%100000002000000001.31819.7173%20.636871.7024%3.0457%
PrimeNet2570.012563.1579%65001100000.00082.4168%0.013364.0483%0.8904%
GPU722610.199765.5738%6500550000.00061.0154%0.200365.9233%0.3496%
Difference+6+19.1190+3.0829%+9993500+199945000+1.3175+8.7019%+20.4365+5.7791%+5.7791%

Known prime factors (1 factor, 79.9 bits, 0.00519282% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
153809311050701047932354798156332579.870359233838523819912
23 × 3 × 14563 × 1027815464201
2015-07-04145631027815464201153,2053,626.86,773.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2011-02-02T01:01:00James HeinrichWHS800001340000---0.010--2.195%
2013-11-21T05:46:00David Campeaui5-2500k94500027405000---0.155--5.943%
2015-03-15T12:12:00VictordeHollanderManual testing10000000200000000---1.318--9.717%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-27T09:20:00Architects Cubeda3_bu2260261--0.100--
2010-05-04T02:59:00GrunwalderGIMPManual testing21263--1.038--
2015-02-09T21:57:00snme2pm1Manual testing263264--1.276--
2015-02-09T21:57:00snme2pm1Manual testing264265--2.429--


ECM factoring results:

Old Calculation Method

Total ECM effort:31.221 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:31.221 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.39024.916%
302500000.11689.004%
3510000000.00899.198%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025013.96
50000500000010.056
250000400000005017.20


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-21T00:00:00ANONYMOUSv4_computersBFCF6FC8D0DD96E70.069
2015-06-27T00:55:00MadPooManual testingBFCF6FC8D0DD96E70.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:47alpertronManual testing
1105070104793235479815633
621E8483CBA213__no
2017-10-18T08:31:47Oliver KruseThreadripper
1105070104793235479815633
621E8483CBA213__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)
103
104
105
106
107
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
265
264
263
261
258
257
250
260
270
280
290
2100
Last modified: 2022-04-14T10:48:22+00:00