is 2 1625989 - 1
has 489472 decimal digits
takes 0.073 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
Actual26718.274468.6567%500000150000000.08354.9968%18.357970.2229%1.5662%
PrimeNet2570.011863.1579%70001200000.00092.5561%0.012764.0996%0.9417%
GPU722610.188965.5738%6500650000.00061.0899%0.189565.9490%0.3752%
Difference+6+18.0854+3.0829%+493500+14935000+0.0829+3.9069%+18.1684+4.2739%+4.2739%

Known prime factors (2 factors, 100.7 bits, 0.00619223% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16259896671075149431239.279205139
11 × 17 × 1097
-1710976.317e-84.912e-67.239e-6
162598930551075628288639431961.406939461325639
3 × 23 × 10853 × 1254527
2015-05-021085312545270.24200.00510.0083

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1625989203808521412232866420658640024931100.685
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-05-02T17:25:00alpertronManual testing50000015000000121961.4060.0840.1450.1674.997%


Trial Factoring results:
No TF results for M1625989


ECM factoring results:

Old Calculation Method

Total ECM effort:14.095 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.095 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110009.6540.006%
25500000.89340.933%
302500000.05694.522%
3510000000.00399.737%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025114.10


Lucas-Lehmer results:
No L-L results for M1625989


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T14:58:05Oliver KruseGTX-1
667107514943
3055107562828863943
83E696E8548203__no
2017-11-01T16:54:52kkmrkkblmbrbkc4.xlarge
667107514943
3055107562828863943
83E696E8548203__no


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
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2019-11-04T17:13:48+00:00