is 2 2515081 - 1
has 757115 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA3FF10E113B75A83double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26711.814367.1642 %2000000600000000.51907.6519 %12.333369.6767 %
Target2630.634665.0794 %110008500000.00571.4092 %0.640365.5715 %
Difference+4+11.1797+2.0848 %+1989000+59150000+0.5133+6.2427%+11.6930+4.1053 %

Known prime factors (1 factor, 68.3 bits, 0.00271554% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25150813628627063197300586332168.29872137379734436
22 × 3 × 139 × 271 × 159586087
2013-09-2227115958608723.6990.87451.6332

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-23ANONYMOUSv4_computers2048204800--0.0010.663%
2003-10-31Team Prime Ribv4_computers15000236250--0.0031.707%
2010-12-19JossManual testing2000020000--0.0020.623%
2011-01-01JossManual testing3000030000--0.0030.823%
2011-01-06JossManual testing5000050000--0.0051.130%
2011-03-03James Heinrichi7-920300000800000012--0.0726.519%
2019-07-04alpertronManual testing20000006000000012---10.570%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-15Steve Wv4_computers212590.015
2022-03-10LordJuliusManual testing21260
2009-01-31Sturle Sundedanzi.ifi2602610.061
2012-06-13Sebastian HornbostelManual testing2612620.122
2013-01-23dbaughManual testing2622630.390


ECM factoring results:
Total ECM effort:0.882 GHz-days
Estimated T-Level:1.538
DigitsB1CompleteFacMiss
20110000.30873.514%
25500000.02897.193%
302500000.00299.821%


ECM Summary

B1B2factorcurvesGHz-days
10.276
50000500000080.606


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23Steve Wv4_computersA3FF10E113B75A830.174


PRP results:
dateuseridcompidcofactorsres64
2017-10-15kkmrkkblmbrbkc4.xlarge
362862706319730058633
F9348B6F2822957D
2017-11-08Oliver KruseThreadripper-PC
362862706319730058633
F9348B6F2822957D


CERT results:
No CERT results for M2515081


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=1.54 ~= -11-bit
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00