is 2 2420569 - 1
has 728664 decimal digits
takes 0.164 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF1066295451A9996double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.275667.1642%2000000600000000.50557.6219%12.781069.6669%2.5027%
PrimeNet2590.031762.7119%100001800000.00192.5225%0.033663.6525%0.9406%
GPU722630.659465.0794%100001400000.00171.2771%0.661065.5253%0.4460%
Difference+4+11.6162+2.0848%+1990000+59860000+0.5038+6.3448%+12.1200+4.1416%+4.1416%

Known prime factors (1 factor, 75.7 bits, 0.00312862% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2420569626842424869977553109032375.73112948245327234579
19 × 1279 × 532827674879
2009-02-0612795328276748794,515.42,843.65,311.1

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.288%
2018-09-28T16:59:41alpertronManual testing20000006000000012---0.505--7.622%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-30T00:00:00ANONYMOUSv4_computers21259--0.032--
2022-03-09T16:37:59LordJuliusManual testing21260--0.063--
2009-01-12T08:52:00Sturle Sundeothello.ifi260261--0.063--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
No L-L results for M2420569


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-13T14:48:13Oliver KruseGTX-0194670CBDD688A__no
2017-11-26T22:35:19ATHec2-1xf
62684242486997755310903
194670CBDD688A__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
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108
109
1010
1011
1012
TF factor-bounds graph:
267
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-09T16:37:59+00:00