is 2 1672651 - 1
has 503519 decimal digits
takes 0.079 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.764668.6567%500000150000000.08805.0139%17.852670.2282%1.5715%
PrimeNet2570.011563.1579%70001200000.00092.5703%0.012464.1048%0.9469%
GPU722610.183665.5738%7000800000.00071.2072%0.184465.9894%0.4156%
Difference+6+17.5809+3.0829%+493000+14920000+0.0873+3.8067%+17.6682+4.2389%+4.2389%

Known prime factors (2 factors, 102.5 bits, 0.00612640% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1672651257621707031134.5857701
3 × 17 × 151
-171512.281e-91.658e-62.361e-6
16726512732577288539901664492167.88981684023999624
23 × 1248151 × 8180503
2019-03-191248151818050322.1120.11090.1733

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1672651703971225665058323074252134364731102.473
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:12alpertronManual testing5000001500000012-
skipped known factor: 25762170703
--0.088--5.014%


Trial Factoring results:
No TF results for M1672651


ECM factoring results:

Old Calculation Method

Total ECM effort:14.894 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.894 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025014.83
50000500000010.059


Lucas-Lehmer results:
No L-L results for M1672651


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T22:59:11Oliver KruseGTX-0
25762170703
5F27B326AE5AF1__no
2017-11-03T00:42:07kkmrkkblmbrbkc4.xlarge
25762170703
5F27B326AE5AF1__no
2019-03-21T10:39:53-Anonymous-
25762170703
273257728853990166449
E787235D78EE04CDno
2019-03-22T03:52:52kkmrkkblmbrbkc5.large
25762170703
273257728853990166449
E787235D78EE04CDno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2019-12-16T13:28:38+00:00