is 2 1915007 - 1
has 576475 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.516368.6567%500000150000000.10155.0964%15.617870.2541%1.5974%
PrimeNet2570.010063.1579%90001700000.00143.0913%0.011464.2968%1.1389%
GPU722610.160465.5738%100001700000.00151.7606%0.161966.1799%0.6061%
Difference+6+15.3559+3.0829%+490000+14830000+0.1000+3.3357%+15.4559+4.0742%+4.0742%

Known prime factors (2 factors, 130.8 bits, 0.00682969% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1915007846971834991181031756.23322114066293
32 × 11 × 17 × 373 × 35227
-373352270.00720.00020.0003
1915007277685097570713419928632374.5567250237141971633
1087 × 6669951372559
2021-10-26108766699513725592,314.828,58653,390

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1915007235191456639172290991154125607102009888940130.789
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:42:25alpertronManual testing5000001500000012-
skipped known factor: 84697183499118103
--0.101--5.096%


Trial Factoring results:
No TF results for M1915007


ECM factoring results:

Old Calculation Method

Total ECM effort:21.584 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:21.584 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110009.0840.011%
25500000.80644.654%
302500000.05095.125%
3510000000.00299.770%


ECM Summary

B1B2factorcurvesGHz-days
500005000000271.875
50000500000010.069
500005799953141.034
50000800000021618.61


Lucas-Lehmer results:
No L-L results for M1915007


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:14:46alpertronManual testing
84697183499118103
64CF26B15995E1__no
2017-10-20T04:22:48Oliver KruseThreadripper
84697183499118103
64CF26B15995E1__no
2021-10-26T06:36:17MarkSdesktop-i7
84697183499118103
27768509757071341992863
4C5A18D9EEAB6DFEno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
250
260
270
280
290
2100
Last modified: 2022-01-06T11:59:22+00:00