is 2 12908767 - 1
has 3885927 decimal digits
takes 5.273 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-
PRPA87070DD2DF99701PRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2672.301864.1791%40000032134830010.59379.6751%12.895567.6448%3.4657%
PrimeNet2640.275762.5000%6000017000000.08854.3328%0.364264.1248%1.6248%
GPU722684.617464.7059%9000024000000.12783.1656%4.745265.8231%1.1173%
Difference-1-2.3156-0.5268%+310000+318948300+10.4658+6.5095%+8.1503+1.8217%+2.3484%

Known prime factors (2 factors, 189.6 bits, 0.00146886% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1290876778729153910451091131962.772304944515268
22 × 3 × 311 × 3461 × 23609
2000-04-273461236090.07310.00270.0042
1290876715230177201550662396976167397664016688139126.8405899160315447115281024193634320
24 × 32 × 5 × 7 × 10709 × 113779 × 144259 × 175633 × 37913999
2022-05-20175633379139991.040e+101.32182.2851

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1290876711990589649843253883579339277055150322407147861191
73886553
58189.612
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-05-16T15:50:49nordisweet16_30.8b14400000400000-
skipped known factor: 7872915391045109113
--0.237--2.431%
2022-05-20T12:19:55nordisweet16_30.8b1440000032134830039126.84010.5910.5521.199.675%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-04-27T00:00:00estrandv4_computers??62.772190.02510.890.053


ECM factoring results:
No ECM results for M12908767


Lucas-Lehmer results:
No L-L results for M12908767


PRP results:
dateuseridcompidcofactorsres64PRP
2022-05-26T18:57:07-Anonymous-
7872915391045109113
152301772015506623969761673976640166881
A87070DD2DF99701no


P-1 factor-bounds graph:
B1 = 400000, B2 = 321348300 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
102
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105
106
102
103
104
105
106
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109
TF factor-bounds graph:
267
2
250
260
270
280
290
2100
2110
2120
2130
Last modified: 2022-05-26T18:57:07+00:00