is 2 2550139 - 1
has 767669 decimal digits
takes 0.177 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L64E54974C3C97821double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.651967.1642%2000000600000000.51907.6628%12.170869.6803%2.5161%
PrimeNet2590.030162.7119%110002000000.00212.6853%0.032363.7132%1.0013%
GPU722630.625965.0794%120001800000.00211.4780%0.628065.5955%0.5161%
Difference+4+11.0260+2.0848%+1988000+59820000+0.5168+6.1847%+11.5429+4.0848%+4.0848%

Known prime factors (1 factor, 76.4 bits, 0.00299469% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2550139975550968560077088962332376.36919127407732678044
22 × 32 × 89 × 277 × 661 × 32604863
2015-08-096613260486310,2410.17870.3337

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.293%
2003-11-08T00:00:00Team Prime Ribv4_computers15000198750---0.003--0.884%
2010-12-19T21:44:00Jocelyn LaroucheManual testing2000020000---0.002--0.315%
2011-01-09T14:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.620%
2011-02-25T09:43:00James Heinrichi7-9203000008000000---0.072--4.387%
2019-07-04T12:40:10alpertronManual testing20000006000000012-
skipped known factor: 97555096856007708896233
--0.519--7.663%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.030--
2022-03-11T02:04:59LordJuliusManual testing21260--0.060--
2009-01-31T14:17:00Sturle Sundegopher.ifi260261--0.060--
2012-06-16T13:42:00Sebastian HornbostelManual testing261262--0.120--
2013-01-23T08:30:00dbaughManual testing262263--0.385--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.770--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.465--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.383 GHz-days
Estimated T-Level:0.750
DigitsB1CurvesCompleteFacMiss
201100015 / 1000.15086.006%
255000015 / 2800.05494.775%

New Calculation Method

Total ECM effort:1.383 GHz-days
Estimated T-Level:0.750
DigitsB1CompleteFacMiss
20110000.48461.639%
25500000.04495.721%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.106
50000500000030.277


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computers64E54974C3C978210.177


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T21:17:30Oliver KruseGTX-24599291E223FA7__no
2017-12-01T12:54:43kkmrkkblmbrbkc4.xlarge
97555096856007708896233
4599291E223FA7__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 198750 (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)
101
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104
105
106
107
101
102
103
104
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106
107
108
TF factor-bounds graph:
267
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-11T02:04:59+00:00