is 2 1915733 - 1
has 576694 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-L8E1C395C784CA889double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.510568.6567%80000003200000001.966510.4703%17.476971.9384%3.2817%
PrimeNet2570.010063.1579%90001700000.00143.0916%0.011464.2969%1.1390%
GPU722610.160365.5738%100001700000.00151.7608%0.161866.1799%0.6062%
Difference+6+15.3501+3.0829%+7990000+319830000+1.9650+8.7095%+17.3151+5.7585%+5.7585%

Known prime factors (1 factor, 111.6 bits, 0.00582563% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1915733394440655919418709422494878326460734111.6031029477113771644350811138291
528509 × 1294087 × 7566739 × 198926243
2017-12-1775667391989262436.811e+101.41531.5923

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-15T12:45:00kurlyslice100000030000000---0.203--6.224%
2017-12-17T16:24:14mikrS06380000003200000001234111.6031.9660.2083.93310.470%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-01T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:58Mark RoseManual testing258260--0.060--
2009-05-31T10:43:00Architects 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--
2015-09-02T13:37:00ramgeisManual testing265266--3.901--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.970 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:20.970 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.8290.015%
25500000.78545.631%
302500000.04995.252%
3510000000.00299.776%


ECM Summary

B1B2factorcurvesGHz-days
500005000000392.708
50000800000021218.26


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers8E1C395C784CA8890.104
2015-07-14T15:04:00MadPooManual testing8E1C395C784CA8890.104


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-19T22:59:20Oliver KruseGTX-3
3944406559194187094224948783264607
2DE2FADCCFB8BD__no
2017-12-20T08:53:00kkmrkkblmbrbkc4.xlarge
3944406559194187094224948783264607
2DE2FADCCFB8BD__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)
105
106
107
105
106
107
108
109
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
2110
2120
Last modified: 2022-01-18T14:10:46+00:00