is 2 4961941 - 1
has 1493694 decimal digits
takes 0.688 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L76B649EC9D41B0C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.988465.6716%1200000431000000.70007.4625%6.688468.2334%2.5618%
PrimeNet2610.061962.2951%220004500000.00913.3090%0.071063.5427%1.2477%
GPU722651.470364.6154%340007000000.01412.4129%1.484565.4692%0.8538%
Difference+2+4.5180+1.0563%+1166000+42400000+0.6859+5.0496%+5.2039+2.7642%+2.7642%

Known prime factors (1 factor, 93.0 bits, 0.00187459% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4961941100149365328882936044424687912993.0161009175293790100850095
32 × 5 × 41 × 30427 × 990799 × 18143687
2015-04-0499079918143687437,080,7290.38700.4053

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-23T18:33:00Carsten Kossendeydurandal30000435000---0.010--1.575%
2011-07-25T18:37:00Squeeky_SquirrelT7500_220060000975000---0.022--2.301%
2015-04-04T08:49:00mikrMSI120000043100000122993.0160.7001.3761.4007.463%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-12-13T00:00:00ANONYMOUSv4_computers21261--0.062--
2009-12-20T04:55:00markrrmst261262--0.062--
2011-11-13T15:25:00GrunwalderGIMPManual testing21263--0.322--
2014-12-29T19:38:00VictordeHollanderManual testing263264--0.396--
2014-12-29T19:38:00VictordeHollanderManual testing264265--0.753--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.262 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:1.262 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.262


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-01T00:00:00James D-Pv4_computers76B649EC9D41B0C60.688
2000-04-19T00:00:00ANONYMOUSv4_computers76B649EC9D41B0C60.688


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T17:04:24kkmrkkblmbrbkManual testing
10014936532888293604442468791
9C20CFBB7BB174__no
2018-04-18T07:01:26ATHwork200557
10014936532888293604442468791
9C20CFBB7BB174__no


P-1 factor-bounds graph:
B1 = 1200000, B2 = 43100000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 60000, B2 = 975000 (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
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-04-18T07:01:26+00:00