is 2 1243789 - 1
has 374418 decimal digits
takes 0.039 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4C906D22A162BB4Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.889868.6567%421847542184750.19394.0699%24.083769.9323%1.2756%
PrimeNet2560.007762.5000%5500900000.00052.4339%0.008263.4127%0.9127%
GPU722600.123565.0000%5000300000.00030.8327%0.123865.2914%0.2914%
Difference+7+23.7664+3.6567%+4213475+4188475+0.1936+3.2372%+23.9599+4.6409%+4.6409%

Known prime factors (1 factor, 91.0 bits, 0.00731690% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
124378924875079093445223645912824632891.007999971823735586327179
3 × 21407 × 55631 × 246203 × 1136843
2015-01-082462031136843485,140,7250.01350.0230

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.238%
2003-11-28T00:00:00eteov4_computers2000002000000---0.014--2.758%
2014-09-25T01:53:00Jocelyn LaroucheManual testing251603251603---0.012--1.371%
2015-01-08T07:48:00mikrMSI421847542184752891.0070.1940.0790.3884.070%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-17T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:31:41LordJuliusManual testing258260--0.093--
2009-02-26T22:04:00Sturle Sundeklengel.ifi260261--0.123--
2011-05-09T14:46:00XyzzyManual testing261262--0.247--
2012-11-13T10:44:00dbaughManual testing262263--0.789--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.461 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000325 / 1003.2503.815%
2550000325 / 2801.16131.261%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:20.461 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100012.7310.000%
25500001.36925.430%
302500000.11089.563%
3510000000.00799.279%


ECM Summary

B1B2factorcurvesGHz-days
50000500000028110.77
25000035000000449.69


Lucas-Lehmer results:
No L-L results for M1243789


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T18:00:14Oliver KruseGTX-0
2487507909344522364591282463
E434750C27BAC5__no
2017-10-20T10:55:20kkmrkkblmbrbkc4.xlarge
2487507909344522364591282463
E434750C27BAC5__no


P-1 factor-bounds graph:
B1 = 4218475 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 251603 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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102
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107
TF factor-bounds graph:
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2100
Last modified: 2022-03-07T17:31:41+00:00