is 2 2520769 - 1
has 758828 decimal digits
takes 0.175 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
Actual26711.787667.1642%2400001998612001.11807.0861%12.905669.4909%
Target2630.633165.0794%110001800000.00201.4339%0.635265.5801%
Difference+4+11.1545+2.0848%+229000+199681200+1.1159+5.6521%+12.2704+3.9108%

Known prime factors (2 factors, 155.4 bits, 0.00616465% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25207693552620582471238.37070467
3 × 83 × 283
-832831.820e-89.444e-61.699e-5
252076916924050060901936214635472464608607336117.02733569220465861679937026106844
22 × 3 × 23 × 353 × 647 × 971 × 24623 × 176977 × 125856649
2022-08-211769771258566497.620e+100.70651.2880

1 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-08-21harleei5-4250U_130024000019986120036117.0271.1180.3502.2367.086%


Trial Factoring results:
No TF results for M2520769


ECM factoring results:
Total ECM effort:0.276 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.276


Lucas-Lehmer results:
No L-L results for M2520769


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14Oliver KruseGTX-0C795FC320E107A__no
2017-12-01kkmrkkblmbrbkc4.xlarge
355262058247
C795FC320E107A__no
2022-08-21LordJuliusWhiteBox
355262058247
169240500609019362146354724646086073
C795FC320E107A6Bno


P-1 factor-bounds graph:
B1 = 240000, B2 = 199861200 (P-1 stage 2)
B1 = 240000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67.7
ECM T-Level=0.58 ~= -15-bit
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2120
Last modified: 2023-03-25T13:08:14+00:00