is 2 2627243 - 1
has 790879 decimal digits
takes 0.203 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBB006C2136047C1Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.309967.1642%2000000600000000.57797.6861%11.887869.6880%2.5238%
PrimeNet2590.029262.7119%110002000000.00242.7001%0.031663.7187%1.0068%
GPU722630.607565.0794%130002000000.00261.5721%0.610165.6283%0.5490%
Difference+4+10.7024+2.0848%+1987000+59800000+0.5753+6.1141%+11.2777+4.0596%+4.0596%

Known prime factors (1 factor, 64.7 bits, 0.00246330% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2627243303203089349430007372064.7175770366299376
24 × 7 × 17 × 6701 × 452269
2011-02-2767014522692.06150.00350.0052

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.295%
2003-11-08T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.915%
2010-12-21T22:27:00Jocelyn LaroucheManual testing2000020000---0.002--0.318%
2010-12-26T02:29:00Jocelyn LaroucheManual testing3000030000---0.003--0.435%
2011-01-19T23:50:00Jocelyn LaroucheManual testing5000050000---0.006--0.623%
2011-02-27T15:38:00James Heinrichi7-9202000000600000002064.7170.2240.4060.4487.686%
2019-07-04T12:42:51alpertronManual testing20000006000000012-
skipped known factor: 30320308934943000737
--0.578--7.686%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
1999-04-02T00:00:00ANONYMOUSv4_computers21259--0.029--
1999-08-07T00:00:00ANONYMOUSv4_computers21259--0.029--
1999-12-23T00:00:00ANONYMOUSv4_computers21259--0.029--
2022-03-11T04:28:50LordJuliusManual testing21260--0.058--
2009-02-13T04:16:00Sturle Sundeghibu.ifi260261--0.058--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.619 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.619 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000060.619


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23T00:00:00ANONYMOUSv4_computersBB006C2136047C1A0.203
1999-08-07T00:00:00ANONYMOUSv4_computersBB006C2136047C1A0.203
1999-12-23T00:00:00ANONYMOUSv4_computersBB006C2136047C1A0.203


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-17T17:10:38Oliver KruseGTX-3
30320308934943000737
1A1CBAB6EFA0F7__no
2017-12-03T23:04:58alan145Bear1
30320308934943000737
1A1CBAB6EFA0F7__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-11T04:28:50+00:00