is 2 78013891 - 1
has 23484522 decimal digits
takes 243.441 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
Actual27449.040863.5135 %730000153300006.90224.2697 %55.943065.0714 %
Target27598.083964.0000 %5000008500000023.09323.7709 %121.177165.3575 %
Difference-1-49.0431-0.4865 %+230000-69670000-16.1910+0.4988%-65.2341-0.2862 %

Known prime factors (1 factor, 92.9 bits, 0.00011914% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7801389195253302275668413938686262392892.94461048936961539589109
3 × 172 × 47 × 13759 × 20533 × 5303003
2014-11-3020533530300318,558,2301.39512.4416

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2014-11-30TheJudgerManual testing730000153300001222892.9448.0123.881%


Trial Factoring results:
57585960616263646566676869707172737475
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-01-15Jossv4_computers212570.000
2004-03-01AxelFoxv4_computers212620.004
2004-06-21AxelFoxv4_computers212640.025
2005-02-02ANONYMOUSv4_computers212650.048
2010-12-23Aleksey Osadchiysl_tlg2652660.096
2011-02-25JaeckelBlack_Sheep2662670.192
2011-03-01Robert M.elbandito2672680.383
2011-03-11NoWhereManbbox_turion2682690.766
2011-03-16ANONYMOUS2692701.533
2013-01-07Bill StaffenManual testing2702713.065
2013-10-15snme2pm1Manual testing2712726.130
2013-11-26snme2pm1Manual testing27227312.26
2013-12-08snme2pm1Manual testing27327424.52


ECM factoring results:
No ECM results for M78013891


Lucas-Lehmer results:
No L-L results for M78013891


PRP results:
No PRP results for M78013891


CERT results:
No CERT results for M78013891


P-1 factor-bounds graph:
B1 = 730000, B2 = 15330000 (P-1 stage 2)
B1 = 730000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 75
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00