is 2 61827253 - 1
has 18611858 decimal digits
takes 145.237 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
Actual27330.938564.3836 %----30.938564.3836 %
Target27461.879964.8649 %4000006500000013.35073.7205 %75.230766.1721 %
Difference-1-30.9414-0.4813 %-400000-65000000-13.3507-3.7205 %-44.2921-1.7885 %

Known prime factors (1 factor, 73.7 bits, 0.00011925% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
61827253156487791606521429173612373.728126552437649560
23 × 5 × 13 × 192767 × 1262509
2013-03-12192767126250947.9500.85511.3363

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-03-12James HeinrichmumG8402373.7284.0280.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-06-17Gordon Spencev4_computers212590.001
2003-11-28Gordon Spencev4_computers212600.001
2004-04-09ANONYMOUSv4_computers212620.005
2022-03-29LordJuliusManual testing262263
2009-02-09ANONYMOUSxp2632640.032
2009-02-11Trace McVeraAetherBox2642650.060
2009-09-29Dr. Nowakazm492652660.121
2009-10-04Dr. Nowakazm492662670.242
2009-10-06Sturle Sundegollumilla.ifi2672680.483
2009-10-09Sturle Sundegollumilla.ifi2682690.967
2012-04-28XyzzyManual testing2692715.802
2013-02-11Jerry HallettManual testing2712727.735
2013-03-02monstManual testing27227315.47


ECM factoring results:
No ECM results for M61827253


Lucas-Lehmer results:
No L-L results for M61827253


PRP results:
No PRP results for M61827253


CERT results:
No CERT results for M61827253


P-1 factor-bounds graph:
104
105
106
104
105
106
107
TF factor-bounds graph:
273
272
271
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