is 2 15112781 - 1
has 4549401 decimal digits
takes 7.579 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDC41D00C46F2C65Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27263.279866.6667%15000004336061730172.829210.2356%236.109070.0785%3.4119%
PrimeNet2650.482863.0769%6500020000000.12394.1474%0.606764.6083%1.5314%
GPU722697.899765.2174%10000026000000.17182.9966%8.071566.2597%1.0423%
Difference+3+55.3801+1.4493%+1400000+4333461730+172.6574+7.2389%+228.0375+3.8188%+2.3696%

Known prime factors (1 factor, 91.2 bits, 0.00060340% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1511278128257338252042321904639810712891.19193488214551783427235
5 × 479 × 19893479 × 1962187967
2022-09-0319893479196218796736,594,64891.422145.20

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-16T00:00:00ANONYMOUSv4_computers1850004208750---0.294--2.655%
2022-03-11T23:06:49Luminescence5950X15000004336061730---172.8--10.236%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-09-03T06:46:15ATHec2-P_11000000100000027P+12891.1911.056


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-31T00:00:00Net_Forcev4_computers21257--0.001--
2000-12-31T00:00:00Net_Forcev4_computers21258--0.003--
2001-01-14T00:00:00FreeTibetv4_computers21265--0.483--
2014-05-14T07:07:00NesowaManual testing265266--0.494--
2014-05-14T07:07:00NesowaManual testing266267--0.989--
2016-11-30T22:40:19mikrManual testing267268--1.978--
2017-10-09T09:34:41ramgeisManual testing268269--3.956--
2021-06-27T22:13:49lycornManual testing269270--7.911--
2021-09-03T15:10:27SRBaseManual testing270271--15.82--
2021-10-10T11:55:40-Anonymous-Manual testing271272--31.65--


ECM factoring results:
Total ECM effort:0.763 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-03-31T00:00:00ANONYMOUSv4_computers6D27351940D391__7.579
2005-09-22T00:00:00Team Prime Ribv4_computersDC41D00C46F2C65F7.579
2006-08-25T00:00:00Team Prime Ribv4_computersDC41D00C46F2C65F7.579
2006-09-11T00:00:00ANONYMOUSv4_computersDC41D00C46F2C65F7.579


PRP results:
No PRP results for M15112781


P-1 factor-bounds graph:
B1 = 1500000, B2 = 4336061730 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 1000000 (P+1 stage 1)
B1 = 185000, B2 = 4208750 (P-1 stage 2)
B1 = 185000 (P-1 stage 1)
104
105
106
107
108
104
105
106
107
108
109
1010
TF factor-bounds graph:
272
271
270
269
268
267
266
265
258
257
250
260
270
280
290
2100
Last modified: 2022-09-03T06:46:15+00:00