is 2 1257749 - 1
has 378621 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-L998BA147B60A4F55double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual270189.982870.0000%250000250000000.07353.5275%190.056271.0583%1.0583%
PrimeNet2560.007662.5000%5500900000.00052.4394%0.008163.4148%0.9148%
GPU722600.122165.0000%5000320000.00030.8566%0.122465.2998%0.2998%
Difference+10+189.8606+5.0000%+245000+24968000+0.0732+2.6710%+189.9338+5.7585%+0.7585%

Known prime factors (1 factor, 68.7 bits, 0.00546569% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12577494945645987287186475992168.745196607033171451
33 × 7 × 1040248852759
2014-02-1827104024885275975.6932,604.64,864.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-10-07T00:00:00ANONYMOUSv4_computers1000010000---0.000--0.078%
2003-09-21T00:00:00Team Prime Ribv4_computers100001000000---0.003--0.612%
2009-06-20T19:27:00Roman MaznichenkoManual testing25000025000000---0.073--3.528%
2016-03-17T19:03:49alpertronManual testing3000001000000012---0.038--3.060%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:32:04LordJuliusManual testing258260--0.092--
2009-02-14T23:07:00Sturle Sundegouffy.ifi260261--0.122--
2011-05-09T14:41:00XyzzyManual testing261262--0.244--
2011-12-06T10:19:00jack731Manual testing262263--0.780--
2011-12-06T10:19:00jack731Manual testing263264--1.561--
2011-12-06T10:19:00jack731Manual testing264265--2.971--
2011-12-06T10:19:00jack731Manual testing265266--5.941--
2014-02-04T13:05:00Never Odd Or EvenManual testing266267--11.88--
2014-02-04T13:05:00Never Odd Or EvenManual testing267268--23.77--
2014-02-04T13:05:00Never Odd Or EvenManual testing268269--47.53--
2014-02-18T12:58:00Never Odd Or EvenManual testing26826968.7452128.300.08157.50
2014-02-04T13:05:00Never Odd Or EvenManual testing269270--95.06--


ECM factoring results:
Total ECM effort:19.230 GHz-days
Estimated T-Level:25.658
DigitsB1CompleteFacMiss
201100014.8080.000%
25500001.62019.795%
302500000.13287.678%
3510000000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028110.79
25000025000000448.444


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2011-12-03T23:49:00jack731jack998BA147B60A4F550.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T19:34:46Oliver KruseGTX-3
494564598728718647599
60D51B33296945__no
2017-10-21T01:45:13kkmrkkblmbrbkc4.xlarge
494564598728718647599
60D51B33296945__no


P-1 factor-bounds graph:
B1 = 250000, B2 = 25000000 (P-1 stage 2)
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 250000 (P-1 stage 1)
B1 = 10000, B2 = 1000000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T17:32:04+00:00