is 2 1458151 - 1
has 438948 decimal digits
takes 0.056 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LABC70B9105CD3E23double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.377868.6567%2000000600000000.28577.2332%20.663570.9238%2.2671%
PrimeNet2560.006662.5000%70001200000.00072.9073%0.007363.5902%1.0902%
GPU722600.105365.0000%6500900000.00061.3982%0.105965.4894%0.4894%
Difference+7+20.2725+3.6567%+1993500+59910000+0.2851+5.8350%+20.5575+5.4345%+5.4345%

Known prime factors (1 factor, 71.9 bits, 0.00493122% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
145815144202933659332491453532271.9051515718662173276
22 × 11 × 43 × 801119800303
2015-05-1443801119800303340.362,416.44,513.1

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.840%
2010-09-17T13:24:00Rob_Deetwopc100000200000---0.006--1.217%
2010-09-18T11:27:00Rob_Deetwopc200000300000---0.011--1.521%
2010-09-19T11:34:00Rob_Deetwopc2000001000000---0.013--2.335%
2010-09-20T12:05:00Rob_Deetwopc2000002000000---0.017--2.822%
2010-09-21T12:14:00Rob_Deetwopc2000003000000---0.020--3.113%
2010-09-22T13:37:00Rob_Deetwopc2000004000000---0.023--3.323%
2010-09-23T12:02:00Rob_Deetwopc2000005000000---0.026--3.487%
2014-11-19T23:20:00Jocelyn LaroucheManual testing244017244017---0.014--1.387%
2015-01-26T12:23:00Jocelyn LaroucheManual testing295259295259---0.016--1.520%
2015-01-28T11:16:00Jocelyn LaroucheManual testing324784324784---0.018--1.590%
2015-01-31T14:55:00Jocelyn LaroucheManual testing357262357262---0.020--1.661%
2015-02-14T12:30:00Jocelyn LaroucheManual testing392988392988---0.022--1.735%
2015-02-16T12:52:00alpertronManual testing200000060000000---0.286--7.233%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.026--
2010-05-09T04:20:00Architects Cubeda3_bu2260261--0.105--
2011-04-05T20:59:00GrunwalderGIMPManual testing21263--1.095--
2015-03-28T21:58:00snme2pm1Manual testing263264--1.346--
2015-03-28T21:58:00snme2pm1Manual testing264265--2.562--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.558 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:25.558 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024911.80
50000500000020.095
250000350000005013.66


Lucas-Lehmer results:
No L-L results for M1458151


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T02:54:20Oliver KruseGTX-3
4420293365933249145353
6FF005BD85C8CF__no
2017-10-27T18:25:29kkmrkkblmbrbkc4.xlarge
4420293365933249145353
6FF005BD85C8CF__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000, B2 = 4000000 (P-1 stage 2)
B1 = 392988 (P-1 stage 1)
B1 = 357262 (P-1 stage 1)
B1 = 200000, B2 = 3000000 (P-1 stage 2)
B1 = 324784 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 295259 (P-1 stage 1)
B1 = 244017 (P-1 stage 1)
B1 = 200000, B2 = 1000000 (P-1 stage 2)
B1 = 200000, B2 = 300000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 100000, B2 = 200000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-28T11:13:11+00:00