is 2 2484721 - 1
has 747976 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-LDCF83121CA91846Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.958767.1642%2382500857701000.69658.1971%12.655269.8558%2.6916%
PrimeNet2590.030962.7119%100001800000.00192.5350%0.032863.6571%0.9452%
GPU722630.642365.0794%110001600000.00191.3804%0.644365.5614%0.4820%
Difference+4+11.3163+2.0848%+2371500+85610100+0.6946+6.8167%+12.0109+4.2944%+4.2944%

Known prime factors (1 factor, 89.4 bits, 0.00359752% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24847218102249641295138036711046792789.388163041436871486537859
32 × 11 × 67 × 2381 × 389891 × 26478013
2014-11-103898912647801365,954,6130.18220.2710

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%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.313%
2011-01-21T23:28:00Oscar Östlin950001947500---0.020--2.680%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120832120832---0.012--1.053%
2014-11-10T17:52:00mikrMSI238250085770100122789.3880.6970.3451.3938.197%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:53:01LordJuliusManual testing21260--0.062--
2009-01-14T06:51:00Sturle Sundegobi.ifi260261--0.062--
2012-06-09T09:43:00Sebastian HornbostelManual testing261262--0.124--
2013-12-04T21:13:00Jerry HallettManual 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)
2000-01-12T00:00:00ANONYMOUSv4_computersDCF83121CA91846C0.172
2001-03-25T00:00:00ANONYMOUSv4_computersDCF83121CA91846C0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T05:11:25Oliver KruseGTX-2BB9CDACD225DA1__no
2017-11-30T04:45:40kkmrkkblmbrbkold
810224964129513803671104679
BB9CDACD225DA1__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 = 120832 (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