is 2 3745897 - 1
has 1127628 decimal digits
takes 0.393 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
Actual2677.932467.1642%1000001303648501.09616.0081%9.028569.1370%1.9728%
PrimeNet2600.041063.3333%160003200000.00503.0902%0.046064.4664%1.1331%
GPU722640.950265.6250%220004500000.00692.1103%0.957166.3504%0.7254%
Difference+3+6.9822+1.5392%+78000+129914850+1.0892+3.8978%+8.0714+2.7866%+2.7866%

Known prime factors (1 factor, 39.8 bits, 0.00106249% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
37458979570242409431239.800127743
3 × 72 × 11 × 79
-49793.226e-87.711e-61.519e-5

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-03-03T20:39:13Jocelyn LaroucheManual testing9000090000-
skipped known factor: 957024240943
--0.014--0.961%
2022-03-22T01:46:42Jocelyn LaroucheManual testing100000100000-
skipped known factor: 957024240943
--0.015--1.021%
2022-05-30T22:36:07Jocelyn LaroucheManual testing100000130364850-
skipped known factor: 957024240943
--1.096--6.008%


Trial Factoring results:
No TF results for M3745897


ECM factoring results:

Old Calculation Method

Total ECM effort:0.448 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.448 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.448


Lucas-Lehmer results:
No L-L results for M3745897


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:17:52kkmrkkblmbrbkManual testing
957024240943
08CBF7BE601A45__no
2017-12-04T02:42:04Oliver KruseThreadripper
957024240943
08CBF7BE601A45__no


P-1 factor-bounds graph:
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-05-30T22:36:07+00:00