is 2 4939751 - 1
has 1487014 decimal digits
takes 0.685 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6BABE734AF61E311double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.015365.6716%1200000397500000.66337.3609%6.678668.1985%2.5269%
PrimeNet2610.062262.2951%220004500000.00913.3066%0.071363.5418%1.2467%
GPU722651.476964.6154%340007000000.01412.4111%1.491165.4685%0.8532%
Difference+2+4.5383+1.0563%+1166000+39050000+0.6492+4.9498%+5.1875+2.7300%+2.7300%

Known prime factors (1 factor, 93.3 bits, 0.00188873% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4939751121820240954859661335112572012993.2991233060542473291278600
23 × 3 × 52 × 7 × 293 × 983 × 762017 × 1337671
2014-12-057620171337671738,332,5080.15950.3117

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-09-14T17:07:00Carsten Kossendeydurandal30000435000---0.010--1.574%
2011-07-18T11:48:00Squeeky_SquirrelT7500_220060000960000---0.022--2.290%
2014-12-05T12:35:00mikrMSI120000039750000122993.2990.6631.3691.3277.361%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-01-13T00:00:00ANONYMOUSv4_computers21261--0.062--
2010-03-21T05:54:00markroldgamer261262--0.062--
2011-09-28T18:57:00GrunwalderGIMPManual testing21263--0.323--


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)
1998-05-23T00:00:00ANONYMOUSv4_computers6BABE734AF61E3110.685
2000-04-05T00:00:00ANONYMOUSv4_computers6BABE734AF61E3110.685


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:59:35kkmrkkblmbrbkManual testing
12182024095485966133511257201
37BC9CB7BCDE10__no
2018-04-13T16:16:31ATHec2-PRPCFDC
12182024095485966133511257201
37BC9CB7BCDE10__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 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
250
260
270
280
290
2100
Last modified: 2018-04-13T16:16:31+00:00