is 2 4950287 - 1
has 1490185 decimal digits
takes 0.686 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1CAF8F85FEB4B859double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.002565.6716%1200000397500000.66337.3626%6.665868.1991%2.5275%
PrimeNet2610.062162.2951%220004500000.00913.3077%0.071263.5423%1.2472%
GPU722651.473864.6154%340007000000.01412.4119%1.487965.4688%0.8535%
Difference+2+4.5287+1.0563%+1166000+39050000+0.6492+4.9506%+5.1779+2.7303%+2.7303%

Known prime factors (1 factor, 100.5 bits, 0.00203077% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4950287182876874544073583090098446992131100.529184713406055117191276080
24 × 3 × 5 × 7 × 17 × 41 × 97 × 859 × 587551 × 3222151
2014-12-2858755132221513.301e+100.14690.2403

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-05-24T00:00:00estrandv4_computers25000218750---0.007--1.219%
2011-07-20T18:30:00harleeP4_260060000960000---0.022--2.291%
2014-12-28T13:48:00mikrMSI1200000397500001231100.5290.6631.3721.3277.363%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-12-31T22:59:00markrrmst261262--0.062--
2011-08-27T22:56:00GrunwalderGIMPManual testing21263--0.322--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.261 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:1.261 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.261


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-09-27T00:00:00ANONYMOUSv4_computers1CAF8F85FEB4B8590.686
2000-06-11T00:00:00estrandv4_computers1CAF8F85FEB4B8590.686


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:41:11kkmrkkblmbrbkManual testing
1828768745440735830900984469921
CFE7A6E433052B__no
2018-04-16T03:30:13ATHec2-PRPCFDC
1828768745440735830900984469921
CFE7A6E433052B__no


P-1 factor-bounds graph:
B1 = 1200000, B2 = 39750000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 218750 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
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103
104
105
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108
TF factor-bounds graph:
267
263
262
250
260
270
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290
2100
2110
Last modified: 2018-04-16T03:30:13+00:00