is 2 1915241 - 1
has 576545 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
Actual26715.514568.6567%500000150000000.10155.0964%15.615970.2541%1.5974%
PrimeNet2570.010063.1579%90001700000.00143.0914%0.011464.2968%1.1389%
GPU722610.160465.5738%100001700000.00151.7607%0.161966.1799%0.6061%
Difference+6+15.3541+3.0829%+490000+14830000+0.1000+3.3358%+15.4541+4.0742%+4.0742%

Known prime factors (2 factors, 102.8 bits, 0.00536596% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1915241271925917191134.6627099
31 × 229
-312291.836e-93.287e-64.963e-6
19152413182170392906555488632168.10983074933987591
7 × 13 × 61 × 14965760041
2021-04-22611496576004137.41164.140119.79

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1915241865314602745977771209341366549731102.771
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:42:25alpertronManual testing5000001500000012-
skipped known factor: 27192591719
--0.101--5.096%


Trial Factoring results:
No TF results for M1915241


ECM factoring results:

Old Calculation Method

Total ECM effort:21.811 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:21.811 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110009.0650.012%
25500000.80444.754%
302500000.05095.140%
3510000000.00299.771%


ECM Summary

B1B2factorcurvesGHz-days
500005000070.293
500005000000201.389
500006156523141.062
50000675000070.554
50000675000010.079
50000800000021418.43


Lucas-Lehmer results:
No L-L results for M1915241


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:14:47alpertronManual testing
27192591719
369C3E95AB1E8E__no
2017-10-20T04:31:30Oliver KruseThreadripper
27192591719
369C3E95AB1E8E__no
2021-04-22T21:41:22mikrNitron
27192591719
318217039290655548863
15C3D25F20BC155Cno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-01-18T14:10:46+00:00