is 2 61897271 - 1
has 18632936 decimal digits
takes 145.401 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
Actual27330.903564.3836 %----30.903564.3836 %
Target27461.809964.8649 %4000006500000013.35073.7210 %75.160766.1722 %
Difference-1-30.9064-0.4813 %-400000-65000000-13.3507-3.7210 %-44.2571-1.7887 %

Known prime factors (1 factor, 79.4 bits, 0.00012829% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
618972718005034818748420526351132479.4056466387523569836
22 × 3 × 19 × 853 × 4861 × 6839939
2013-02-26486168399393,303.51.28502.3708

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2013-02-26HBendtzHAL90072479.4054.1370.000%


Trial Factoring results:
575859606162636465666768697071727374
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-06-17Gordon Spencev4_computers212590.001
2003-12-13Gordon Spencev4_computers212600.001
2004-04-20ANONYMOUSv4_computers212620.005
2022-03-29LordJuliusManual testing262263
2009-02-14abcC30D35CA52632640.032
2009-07-26S36049Wolle22642650.060
2009-08-01FCG Primesclarke2652660.121
2009-08-07riccardo.brascaquark2662670.241
2009-08-11arnaudSRV-2402672680.483
2009-08-18usmfunsigna022682690.966
2011-11-25Zet_kormeganet_i52692701.932
2013-02-16XyzzyManual testing2702713.863
2013-02-22bcp19Manual testing2712727.727
2013-02-23RichD0Manual testing27227315.45


ECM factoring results:
No ECM results for M61897271


Lucas-Lehmer results:
No L-L results for M61897271


PRP results:
No PRP results for M61897271


CERT results:
No CERT results for M61897271


P-1 factor-bounds graph:
102
103
104
102
103
104
105
106
107
TF factor-bounds graph:
273
272
271
270
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