is 2 1246501 - 1
has 375235 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA5A7140754E00310double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.837968.6567%42184751560835650.57418.7481%24.412071.3987%2.7419%
PrimeNet2560.007762.5000%5500900000.00052.4350%0.008263.4131%0.9131%
GPU722600.123265.0000%5000300000.00030.8331%0.123565.2916%0.2916%
Difference+7+23.7146+3.6567%+4213475+156053565+0.5738+7.9150%+24.2885+6.1071%+6.1071%

Known prime factors (1 factor, 83.3 bits, 0.00668176% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1246501118096023723221673940966012683.2884737101042166098300
22 × 52 × 47371010421660983
2016-05-1625473710104216609832,986,618118,610,431221,531,254

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.238%
2003-11-28T00:00:00eteov4_computers2000002000000---0.014--2.759%
2014-09-25T01:53:00Jocelyn LaroucheManual testing251491251491---0.012--1.372%
2015-01-13T07:23:00mikrMSI4218475156083565---0.574--8.748%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-17T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2016-02-23T16:28:25Mark RoseManual testing258260--0.092--
2009-02-15T11:03:00Sturle Sundegoscha.ifi260261--0.123--
2012-09-14T15:01:00AxelssonManual testing261262--0.246--
2012-10-07T08:33:00dbaughManual testing262263--0.788--
2015-04-04T11:16:00omylistManual testing263264--1.575--
2015-04-06T10:49:00monstManual testing264265--2.997--
2015-09-20T20:58:00ramgeisManual testing265266--5.995--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.126 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000323 / 1003.2303.892%
2550000323 / 2801.15431.486%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:19.126 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100014.7310.000%
25500001.61319.937%
302500000.13187.717%
3510000000.00999.131%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000027910.69
25000025000000448.432


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-11-12T20:09:50MadPooManual testingA5A7140754E003100.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T18:13:49Oliver KruseGTX-1
11809602372322167394096601
3C8A31D1638395__no
2017-10-20T13:11:39kkmrkkblmbrbkc4.xlarge
11809602372322167394096601
3C8A31D1638395__no


P-1 factor-bounds graph:
B1 = 4218475, B2 = 156083565 (P-1 stage 2)
B1 = 4218475 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 251491 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-03-12T16:32:49+00:00