is 2 523937 - 1
has 157721 decimal digits
takes 0.008 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actualunknown100000008300000001.156241.6700%1.156241.6700%
Target2440.000056.8182%900015000000.001914.6042%0.001963.1245%
Difference-440.0000-56.8182%+9991000+828500000+1.1543+27.0658%+1.1543-21.4546%

Known prime factors (1 factor, 30.4 bits, 0.00579872% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
52393713989117911030.3821335
3 × 5 × 89
-5893.519e-102.025e-72.152e-7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17alpertronManual testing15000005000000012-
skipped known factor: 1398911791
--0.088--32.852%
2021-06-07happy5214Manual testing10000000830000000-
skipped known factor: 1398911791
--1.156--41.670%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-06-07happy5214Manual testing500000036500000027--0.485


Trial Factoring results:
No TF results for M523937


ECM factoring results:
Total ECM effort:16.118 GHz-days
Estimated T-Level:26.435
DigitsB1CompleteFacMiss
201100023.8990.000%
25500003.0284.840%
302500000.28775.049%
3510000000.02297.832%
4030000000.00199.860%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002814.525
2500002500000014411.59


Lucas-Lehmer results:
No L-L results for M523937


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-27Oliver KruseGTX-3
1398911791
6B54D58029A45E__no
2017-09-28Oliver KruseManual testing
1398911791
6B54D58029A45E__no
2017-11-07kkmrkkblmbrbkc4.xlarge
1398911791
6B54D58029A45E__no
2020-04-19Oliver KruseAddPrpType5
1398911791
66C93E427E7E7C__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 830000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 1500000, B2 = 50000000 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
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109
TF factor-bounds graph:
this exponent TF target: 44
TF double-checked to: 67.9
ECM T-Level=26.44 ~= 71-bit
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Last modified: 2023-10-02T12:12:48+00:00