is 2 1915931 - 1
has 576753 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5F3790BC5F37F355double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.508968.6567%80000003200000001.966510.4704%17.475371.9385%3.2818%
PrimeNet2570.010063.1579%90001700000.00143.0916%0.011464.2969%1.1390%
GPU722610.160365.5738%100001700000.00151.7608%0.161866.1799%0.6062%
Difference+6+15.3485+3.0829%+7990000+319830000+1.9650+8.7096%+17.3135+5.7585%+5.7585%

Known prime factors (2 factors, 174.5 bits, 0.00910892% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19159312328907367983932880821132477.62460777433216121376
25 × 3 × 19 × 550663 × 60510623
2017-12-175506636051062316,7230.30030.4844
19159311475008726959567416726115717773096.89738493263247986681585248
25 × 72 × 277 × 431 × 3566149 × 57660997
2017-12-173566149576609978.427e+90.51240.5709

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
191593134351586920567376539002446442708426138850186769324
801
53174.521
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-18T23:56:00kurlyslice100000030000000---0.203--6.224%
2017-12-17T11:25:37mikrS06280000003200000001253174.5211.9660.2083.93310.470%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-01T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-05-31T13:57:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:58Mark RoseManual testing261262--0.160--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--0.833--
2016-02-23T16:28:58Mark RoseManual testing262263--0.512--
2015-05-16T20:58:00snme2pm1Manual testing263264--1.025--
2015-05-16T20:58:00snme2pm1Manual testing264265--1.950--
2015-10-02T08:43:13ramgeisManual testing265266--3.900--
2017-03-15T08:26:29Smok_bmvManual testing266267--7.801--


ECM factoring results:

Old Calculation Method

Total ECM effort:21.456 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:21.456 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110009.0550.012%
25500000.80544.709%
302500000.05095.132%
3510000000.00299.771%


ECM Summary

B1B2factorcurvesGHz-days
500005000000463.194
50000800000021218.26


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers5F3790BC5F37F3550.104
2015-07-14T15:04:00MadPooManual testing5F3790BC5F37F3550.104


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-17T11:40:25ATHec2-1xd
232890736798393288082113
147500872695956741672611571777
1BE8C55EAB19D2__no
2017-12-17T18:50:22kkmrkkblmbrbkc4.xlarge
232890736798393288082113
147500872695956741672611571777
1BE8C55EAB19D2__no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-01-25T15:25:43+00:00