is 2 2473907 - 1
has 744721 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-L1FF75E274E48DCCEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.010967.1642%2000000600000000.51907.6390%12.529969.6725%2.5083%
PrimeNet2590.031062.7119%100001800000.00192.5329%0.033063.6563%0.9445%
GPU722630.645165.0794%110001600000.00191.3791%0.647165.5610%0.4816%
Difference+4+11.3658+2.0848%+1989000+59840000+0.5170+6.2598%+11.8828+4.1115%+4.1115%

Known prime factors (1 factor, 67.1 bits, 0.00271042% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24739071531228024886829213112167.05330947566438165
5 × 13 × 29 × 37 × 443724517
2012-08-143744372451713.8022.43144.5412

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--0.918%
2010-11-20T12:24:00Jocelyn LaroucheManual testing2000020000---0.002--0.313%
2010-12-10T00:56:00Jocelyn LaroucheManual testing247390247390---0.025--1.522%
2019-07-04T12:37:46alpertronManual testing20000006000000012---0.519--7.639%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
1999-07-04T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:52:59LordJuliusManual testing21260--0.062--
2009-01-14T18:19:00Sturle Sundegouffy.ifi260261--0.062--
2012-08-04T09:32:00Grant McCrackenthumper261262--0.124--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.551 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.551 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000060.551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computers1FF75E274E48DCCE0.172
1999-07-04T00:00:00ANONYMOUSv4_computers1FF75E274E48DCCE0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T14:16:01kkmrkkblmbrbkc4.xlargeDD5D48D9022BA1__no
2017-11-05T19:12:11Oliver KruseGTX-3
153122802488682921311
DD5D48D9022BA1__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 247390 (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)
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TF factor-bounds graph:
267
262
261
260
259
250
260
270
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290
2100
Last modified: 2022-03-10T05:52:59+00:00