is 2 2482499 - 1
has 747307 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L154E916710AA5B7Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.969467.1642%2382500857701000.69658.1964%12.665969.8555%2.6913%
PrimeNet2590.030962.7119%100001800000.00192.5345%0.032963.6569%0.9451%
GPU722630.642965.0794%110001600000.00191.3801%0.644865.5613%0.4819%
Difference+4+11.3265+2.0848%+2371500+85610100+0.6946+6.8163%+12.0211+4.2942%+4.2942%

Known prime factors (1 factor, 89.3 bits, 0.00359654% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24824997536823828005160821503959032789.284151799131198142694549
32 × 37 × 43 × 499 × 1033 × 1319 × 15592327
2014-11-0513191559232751,912,3710.08560.1596

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.290%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.919%
2010-11-20T12:25:00Jocelyn LaroucheManual testing2000020000---0.002--0.313%
2011-01-21T07:01:00Oscar Östlin950001947500---0.020--2.679%
2014-09-02T00:10:00Jocelyn LaroucheManual testing120855120855---0.012--1.053%
2014-11-05T06:56:00mikrMSI238250085770100122789.2840.6970.3441.3938.196%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:53:01LordJuliusManual testing21260--0.062--
2009-01-14T14:49:00Sturle Sundeghini.ifi260261--0.062--
2012-06-10T21:43:00Sebastian HornbostelManual testing261262--0.124--
2013-08-21T05:37:00David CampeauManual testing262263--0.395--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.102


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-11-10T00:00:00ANONYMOUSv4_computers154E916710AA5B7C0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T04:47:27Oliver KruseGTX-36A416933C415B5__no
2017-11-29T12:00:23ATHec2-1xf
753682382800516082150395903
6A416933C415B5__no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120855 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-10T05:53:01+00:00