is 2 1745927 - 1
has 525577 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF7A0B912E8B19C00double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26717.019068.6567 %500000150000000.10155.0399 %17.120570.2364 %
Target2610.175965.5738 %80005500000.00301.4120 %0.178966.0599 %
Difference+6+16.8431+3.0829 %+492000+14450000+0.0985+3.6279%+16.9416+4.1765 %

Known prime factors (1 factor, 62.0 bits, 0.00355079% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
174592745931823532969008891961.9941315399313172
22 × 3 × 7 × 47287 × 331159
2008-07-22472873311590.17590.00490.0076

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 4593182353296900889
---8.820%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-21PHeedev4_computers212570.011
2003-02-02ANONYMOUSv4_computers212580.022


ECM factoring results:
Total ECM effort:38.447 GHz-days
Estimated T-Level:25.714
DigitsB1CompleteFacMiss
201100014.7080.000%
25500001.67318.766%
302500000.14386.697%
3510000000.01099.015%


ECM Summary

B1B2factorcurvesGHz-days
10.103
50000500000025517.52
250000400000004920.82


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06PHeedev4_computersF7A0B912E8B19C000.095


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-2
4593182353296900889
156876BDB7BDFE37
2017-11-03kkmrkkblmbrbkold
4593182353296900889
156876BDB7BDFE37


CERT results:
No CERT results for M1745927


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-03-03T02:29:32+00:00