is 2 16818761 - 1
has 5062952 decimal digits
takes 9.197 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDFFB5DBA6D8685A7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2683.544063.2353%19500022912500.24523.6617%3.789164.5815%1.3462%
PrimeNet2650.433861.5385%8000024000000.16364.5234%0.597463.2782%1.7398%
GPU722697.098463.7681%12000032000000.22823.2903%7.326664.9602%1.1921%
Difference-1-3.5545-0.5328%+75000-908750+0.0170+0.3714%-3.5375-0.3787%-0.3787%

Known prime factors (1 factor, 66.0 bits, 0.00039261% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16818761754368945239391033832066.0322242641254131
29 × 53 × 509 × 2866607
2014-09-1550928666071.65730.12420.2313

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-10-26T00:00:00MadPoov4_computers1950002291250---0.245--3.662%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-14T00:00:00ANONYMOUSv4_computers21256--0.001--
2001-04-15T00:00:00Net_Forcev4_computers21259--0.005--
2001-07-29T00:00:00David Barleyv4_computers21265--0.434--
2022-08-10T19:28:56LordJuliusManual testing21265--0.434--
2022-08-10T19:28:56LordJuliusManual testing265266--0.444--
2014-09-15T21:08:00NesowaManual testing26626766.032200.77918.721.586
2022-08-10T19:28:56LordJuliusManual testing26626766.032200.77918.721.586
2022-08-10T19:28:56LordJuliusManual testing267268--1.777--


ECM factoring results:
No ECM results for M16818761


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-12-09T00:00:00MadPoov4_computersDFFB5DBA6D8685A79.197
2006-05-29T00:00:00ANONYMOUSv4_computersDFFB5DBA6D8685A79.197


PRP results:
No PRP results for M16818761


P-1 factor-bounds graph:
B1 = 195000, B2 = 2291250 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-10T19:28:56+00:00