is 2 61284647 - 1
has 18448518 decimal digits
takes 143.962 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
Actual2691.948162.3188 %----1.948162.3188 %
Target27462.427864.8649 %4000006500000013.35073.7163 %75.778566.1706 %
Difference-5-60.4797-2.5460 %-400000-65000000-13.3507-3.7163 %-73.8305-3.8517 %

Known prime factors (1 factor, 72.0 bits, 0.00011743% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6128464746126566651054139849192271.96637633052411197
71 × 13877 × 38195791
2012-04-2313877381957918.47157.132913.239

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-04-23Craig MeyersManual testing2271.9662.9320.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-06-17Gordon Spencev4_computers212590.001
2003-10-23Gordon Spencev4_computers212600.001
2004-04-09ANONYMOUSv4_computers212620.005
2022-03-29LordJuliusManual testing262263
2009-04-03ANONYMOUS2632640.032
2009-04-04willmorebackup2642650.061
2009-04-06Sturle Sundeeames.ifi2652660.122
2009-04-08YanktonBarada2662670.244
2009-04-11YanktonBarada2672680.488
2009-09-22Clark B. WierdaCF-272682690.975


ECM factoring results:
No ECM results for M61284647


Lucas-Lehmer results:
No L-L results for M61284647


PRP results:
No PRP results for M61284647


CERT results:
No CERT results for M61284647


P-1 factor-bounds graph:
103
104
105
103
104
105
106
107
108
TF factor-bounds graph:
269
268
267
266
265
264
263
262
260
259
this exponent TF target: 74
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00