is 2 1511891 - 1
has 455125 decimal digits
takes 0.068 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA79BF28EA93C38BCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.653568.6567%500000150000000.08354.9531%19.737070.2092%1.5525%
PrimeNet2570.012763.1579%65001000000.00082.3441%0.013464.0215%0.8636%
GPU722610.203265.5738%6000500000.00050.9496%0.203765.9007%0.3269%
Difference+6+19.4503+3.0829%+494000+14950000+0.0830+4.0035%+19.5333+4.3085%+4.3085%

Known prime factors (1 factor, 83.7 bits, 0.00553341% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1511891152729217449282707745190312683.6595050933481622772665
32 × 5 × 176179 × 637096170703
2013-07-241761796370961707031,964,5612,248.14,198.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-27T01:33:00James HeinrichWHS800001320000---0.010--2.181%
2016-03-17T19:15:41alpertronManual testing5000001500000012---0.084--4.953%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2010-04-24T18:20:00Architects Cubeda3_bu2260261--0.102--
2010-06-17T23:47:00GrunwalderGIMPManual testing21263--1.056--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.828 GHz-days
Estimated T-Level:24.429
DigitsB1CurvesCompleteFacMiss
2011000248 / 1002.4808.270%
2550000248 / 2800.88641.177%

New Calculation Method

Total ECM effort:13.828 GHz-days
Estimated T-Level:24.429
DigitsB1CompleteFacMiss
20110008.0000.034%
25500000.72348.528%
302500000.04595.645%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024813.83


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00ANONYMOUSv4_computersA79BF28EA93C38BC0.068


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T11:40:20Oliver KruseGTX-2
15272921744928270774519031
67FB6B61E0D695__no
2017-10-29T13:50:09kkmrkkblmbrbkc4.xlarge
15272921744928270774519031
67FB6B61E0D695__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1320000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2019-06-07T09:12:26+00:00