is 2 15242441 - 1
has 4588432 decimal digits
takes 7.645 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2671.949464.1791%40000041809950016.840410.1461%18.789967.8135%
Target2697.832565.2174%100000130000000.58383.0004%8.416466.2610%
Difference-2-5.8831-1.0383%+300000+405099500+16.2566+7.1457%+10.3735+1.5525%

Known prime factors (3 factors, 209.8 bits, 0.00137654% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
152424411624234512971237.2415328
24 × 32 × 37
-16371.385e-91.247e-52.368e-5
15242441109507793120411443.316359220
22 × 3 × 5 × 5987
2008-09-08559871.348e-70.00020.0004
1524244181532052855578166941777775377955312740139129.26126745077397897806178740588655700
22 × 52 × 37 × 67 × 151 × 433 × 509 × 26497 × 302123 × 404952619
2023-06-023021234049526191.190e+1016.25229.967

4 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2023-05-21nordisweet16_30.8b14400000400000-
skipped known factor: 162423451297
skipped known factor: 10950779312041
--0.291--2.491%
2023-06-02nordisweet16_30.8b1440000041809950039129.26116.8415.2933.6810.146%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-08Will EdgingtonManual testing??43.316145.79077e-823.291.76449e-7


ECM factoring results:
No ECM results for M15242441


Lucas-Lehmer results:
No L-L results for M15242441


PRP results:
dateuseridcompidcofactorsres64PRP
2023-07-05g0bg0b-Work
162423451297
10950779312041
815320528555781669417777753779553127401
D99EE4F3366BFDD7no


P-1 factor-bounds graph:
B1 = 400000, B2 = 418099500 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
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109
TF factor-bounds graph:
2
this exponent TF target: 69
TF double-checked to: 67.9
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Last modified: 2023-09-25T11:53:03+00:00