is 2 2495501 - 1
has 751221 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDAFC1CDBE2D0AF22double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.907067.1642%2382500857701000.69658.2006%12.603569.8569%2.6927%
PrimeNet2590.030862.7119%100001800000.00192.5370%0.032763.6579%0.9460%
GPU722630.639665.0794%110001600000.00191.3816%0.641565.5618%0.4825%
Difference+4+11.2674+2.0848%+2371500+85610100+0.6946+6.8190%+11.9621+4.2951%+4.2951%

Known prime factors (1 factor, 85.4 bits, 0.00342180% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2495501507305609086516888096175592685.39110164404043246564279
32 × 7 × 29 × 6337 × 50359 × 17433419
2014-12-0850359174334193,411,1220.10030.1784

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.291%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.920%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.314%
2011-01-25T03:30:00Oscar Östlin950001971250---0.020--2.689%
2014-09-10T00:51:00Jocelyn LaroucheManual testing120720120720---0.012--1.054%
2014-12-08T01:09:00mikrMSI238250085770100122685.3910.6970.3461.3938.201%
2019-07-04T12:37:58alpertronManual testing20000006000000012-
skipped known factor: 50730560908651688809617559
--0.519--7.646%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:53:03LordJuliusManual testing21260--0.062--
2009-01-11T09:19:00Sturle Sundeginglo.ifi260261--0.062--
2012-06-11T12:43:00Sebastian HornbostelManual testing261262--0.123--
2013-01-23T08:30:00dbaughManual testing262263--0.393--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.103 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.103 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.103


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-16T00:00:00ANONYMOUSv4_computersDAFC1CDBE2D0AF220.173


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T23:41:38kkmrkkblmbrbkc4.xlarge7D928F79FFC017__no
2017-11-07T08:32:16Oliver KruseGTX-2
50730560908651688809617559
7D928F79FFC017__no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 120720 (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: 2022-03-10T05:53:03+00:00