is 2 15072823 - 1
has 4537372 decimal digits
takes 7.559 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L55A6BEC5F4329202double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274253.825467.5676%18500044400000.30312.1429%254.128568.2625%0.6950%
PrimeNet2650.484063.0769%6500020000000.12394.1458%0.608064.6077%1.5308%
GPU722697.920765.2174%10000026000000.17182.9954%8.092466.2593%1.0419%
Difference+5+245.9048+2.3502%+85000+1840000+0.1313-0.8526%+246.0361+2.0033%+2.0033%

Known prime factors (1 factor, 82.0 bits, 0.00054375% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1507282346990608513677766830176392581.959155878591932240453
32 × 31 × 293 × 1301 × 1597 × 917767
2022-07-05159791776745,8040.03750.0679

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-10T00:00:00ANONYMOUSv4_computers1850004440000---0.303--2.143%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-07-05T08:44:27ATHec2-P_11000000100000027P-12581.9591.056


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-31T00:00:00Net_Forcev4_computers21257--0.001--
2001-04-08T00:00:00subgeniusv4_computers21265--0.484--
2016-03-16T02:28:07Mark RoseManual testing265266--0.496--
2014-06-11T15:22:00NesowaManual testing266267--0.992--
2016-04-08T20:20:06mikrManual testing267268--1.983--
2017-10-06T08:46:39ramgeisManual testing268269--3.966--
2021-07-06T23:47:27lycornManual testing269270--7.932--
2021-09-02T18:20:59SRBaseManual testing270271--15.86--
2021-10-10T11:55:46-Anonymous-Manual testing271272--31.73--
2022-01-22T14:28:01-Anonymous-GPU72_TF272273--63.46--
2022-03-05T06:50:06Yves de WandelaarManual testing273274--126.9--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.763 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.763 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-03-24T00:00:00ANONYMOUSv4_computers14FD4B2A13586D__7.559
2006-03-28T00:00:00ANONYMOUSv4_computers55A6BEC5F43292027.559
2006-10-01T00:00:00Team Prime Ribv4_computers55A6BEC5F43292027.559


PRP results:
No PRP results for M15072823


P-1 factor-bounds graph:
B1 = 1000000 (P-1 stage 1)
B1 = 185000, B2 = 4440000 (P-1 stage 2)
B1 = 185000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
257
250
260
270
280
290
2100
Last modified: 2022-07-05T08:44:27+00:00