is 2 1263391 - 1
has 380319 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-L69E3CD213B3A8278double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26847.178569.1176%36000000121104173190304.792318.7099%351.970874.8957%5.7780%
PrimeNet2560.007662.5000%5500900000.00052.4416%0.008163.4156%0.9156%
GPU722600.121665.0000%5500340000.00030.9084%0.121965.3179%0.3179%
Difference+8+47.0569+4.1176%+35994500+121104139190+304.7920+17.8015%+351.8489+9.5778%+5.4601%

Known prime factors:
No known factors for M1263391

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.192%
2003-12-23T00:00:00eteov4_computers2000005000000---0.021--3.066%
2014-09-29T22:04:00Jocelyn LaroucheManual testing250803250803---0.012--1.207%
2015-02-08T14:42:00mikrMSI4218475156083565---0.574--8.095%
2022-05-19T13:14:15Sid & AndyPterodactyl36000000121104173190---304.8--18.710%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-10T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.030--
2016-02-23T16:28:26Mark RoseManual testing258260--0.091--
2009-02-15T17:06:00Sturle Sundeghini.ifi260261--0.122--
2011-05-09T14:41:00XyzzyManual testing261262--0.243--
2012-10-11T11:56:00dbaughManual testing262263--0.777--
2015-04-08T01:09:00omylistManual testing263264--1.554--
2015-04-09T02:12:00monstManual testing264265--2.957--
2015-09-23T08:42:46ramgeisManual testing265266--5.915--
2018-09-16T10:11:03YxinityManual testing266267--11.83--
2020-04-30T23:11:18Gordon SpenceManual testing267268--23.66--


ECM factoring results:
Total ECM effort:19.358 GHz-days
Estimated T-Level:25.674
DigitsB1CompleteFacMiss
201100014.3150.000%
25500001.60820.026%
302500000.13587.391%
3510000000.00999.079%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002549.76
25000025000000509.60


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-08-31T00:00:00ANONYMOUSv4_computers69E3CD213B3A82780.040
2016-06-01T18:50:18MadPooManual testing69E3CD213B3A82780.040


PRP results:
No PRP results for M1263391


P-1 factor-bounds graph:
B1 = 36000000, B2 = 121104173190 (P-1 stage 2)
B1 = 36000000 (P-1 stage 1)
B1 = 4218475, B2 = 156083565 (P-1 stage 2)
B1 = 4218475 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 250803 (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: 2022-05-19T13:14:15+00:00