is 2 1304803 - 1
has 392785 decimal digits
takes 0.041 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC63171D6CBD03A6Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26722.772768.6567%1190000345100000.13816.2151%22.910870.6047%1.9480%
PrimeNet2560.007462.5000%60001000000.00052.5955%0.007963.4733%0.9733%
GPU722600.117765.0000%5500360000.00030.9357%0.118065.3275%0.3275%
Difference+7+22.6550+3.6567%+1184500+34474000+0.1378+5.2793%+22.7928+5.2772%+5.2772%

Known prime factors (1 factor, 85.5 bits, 0.00655021% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1304803534847528364442957377512312685.46720495336398078597205
5 × 2477 × 1654851546070133
2014-03-082477165485154607013311,705,1394,143,5187,738,939

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers100001000000---0.003--1.010%
2013-11-11T13:30:00David Campeaui5-2500k119000034510000---0.138--6.215%
2016-03-17T19:04:42alpertronManual testing5000001500000012---0.059--4.866%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.029--
2022-03-07T17:32:09LordJuliusManual testing258260--0.088--
2009-02-15T23:15:00Sturle Sundegoldiek.ifi260261--0.118--
2011-05-09T14:43:00XyzzyManual testing261262--0.235--
2013-01-03T08:41:00dbaughManual testing262263--0.752--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.683 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:20.683 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.1670.001%
25500001.34825.975%
302500000.11289.363%
3510000000.00899.239%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002489.57
250000350000005011.11


Lucas-Lehmer results:
No L-L results for M1304803


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T01:09:02Oliver KruseGTX-2
53484752836444295737751231
2C6D0DF180A367__no
2017-10-22T22:30:43kkmrkkblmbrbkc4.xlarge
53484752836444295737751231
2C6D0DF180A367__no


P-1 factor-bounds graph:
B1 = 1190000, B2 = 34510000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1190000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 10000, B2 = 1000000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-03-07T17:32:09+00:00