is 2 55281983 - 1
has 16641536 decimal digits
takes 117.167 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2ABAFBBB314691CCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2718.648063.3803 %----8.648063.3803 %
Target27334.601664.3836 %3600006000000011.09223.9326 %45.693865.7842 %
Difference-2-25.9536-1.0033 %-360000-60000000-11.0922-3.9326 %-37.0458-2.4039 %

Known prime factors (1 factor, 77.8 bits, 0.00014079% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
552819832686857044650004684552332477.8302430138083731552
25 × 3917 × 19139 × 1012997
2012-08-17191391012997890.670.22520.3168

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-08-17David Campeaui5-work2477.8304.7430.000%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers212532.17000e-5
2000-03-08ANONYMOUSv4_computers212544.34000e-5
2000-05-31ANONYMOUSv4_computers212560.000
2001-09-16ANONYMOUSv4_computers212570.000
2002-07-14ANONYMOUSv4_computers212580.001
2008-10-271997rj7Manual testing212640.034
2009-11-15Sturle Sundegideon.ifi2642650.068
2009-11-18Steve_Richtersteven12652660.135
2009-11-21Helmut Zulusz52662670.270
2010-03-01angel63AGGG752672680.541
2011-04-06ANONYMOUS2682691.081
2011-06-10shaugeManual testing2692716.488


ECM factoring results:
No ECM results for M55281983


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2012-01-24borgygOfficeComp22ABAFBBB314691CC117.2


PRP results:
No PRP results for M55281983


CERT results:
No CERT results for M55281983


P-1 factor-bounds graph:
103
104
105
103
104
105
106
107
TF factor-bounds graph:
271
269
268
267
266
265
264
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00