is 2 1911037 - 1
has 575280 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-L4A706B70BB71F1E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.548668.6567%1000000300000000.20296.2218%15.751570.6068%1.9501%
PrimeNet2570.010063.1579%90001600000.00143.0413%0.011464.2784%1.1205%
GPU722610.160765.5738%100001700000.00151.7599%0.162266.1796%0.6059%
Difference+6+15.3878+3.0829%+990000+29830000+0.2015+4.4619%+15.5893+4.4272%+4.4272%

Known prime factors (1 factor, 79.5 bits, 0.00416237% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19110378815756257351430099311112479.544230653730339900015
5 × 547 × 84334087875649
2017-11-045478433408787564977,864361,435675,060

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-07-20T00:36:00kurlykurlytop100000030000000---0.203--6.222%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:57Mark RoseManual testing258260--0.060--
2009-05-28T06:38:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:57Mark RoseManual testing261262--0.161--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--0.835--
2016-02-23T16:28:57Mark RoseManual testing262263--0.514--
2015-05-16T01:14:00snme2pm1Manual testing263264--1.027--
2015-05-16T01:14:00snme2pm1Manual testing264265--1.955--
2015-09-01T08:49:00ramgeisManual testing265266--3.910--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.805 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.805 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.7960.015%
25500000.79745.076%
302500000.04995.191%
3510000000.00299.774%


ECM Summary

B1B2factorcurvesGHz-days
500005000000422.915
50000500000030.208
50000660000021316.68


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers4A706B70BB71F1E80.104
2015-06-28T05:06:00MadPooManual testing4A706B70BB71F1E80.104


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-05T11:46:37Oliver KruseGTX-2
881575625735143009931111
F56F8EDE3A7225__no
2017-11-09T17:52:14kkmrkkblmbrbkc4.large
881575625735143009931111
F56F8EDE3A7225__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
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108
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2022-01-06T11:57:34+00:00