is 2 1758371 - 1
has 529323 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3639D54EDDF210C0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.898568.6567%500000150000000.10155.0442%17.000070.2377%1.5810%
PrimeNet2570.010963.1579%80001400000.00122.8050%0.012164.1913%1.0334%
GPU722610.174765.5738%80001100000.00111.4141%0.175866.0606%0.4868%
Difference+6+16.7239+3.0829%+492000+14890000+0.1004+3.6302%+16.8243+4.1772%+4.1772%

Known prime factors (2 factors, 147.9 bits, 0.00841010% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17583714982310010383990032172168.755141674026993848
23 × 32 × 13829 × 142287571
2008-07-311382914228757140.4330.61081.1390
17583716593199804706334061741132479.125187480338469706736
24 × 33 × 47 × 9233665212259
2019-07-31479233665212259129,85339,57373,912

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
175837132849365387450136311329212961482043274912152145147.881
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:30:03alpertronManual testing5000001500000012---0.101--5.044%


Trial Factoring results:
No TF results for M1758371


ECM factoring results:

Old Calculation Method

Total ECM effort:27.575 GHz-days
DigitsB1CurvesCompleteFacMiss
2011000401 / 1004.0101.777%
2550000401 / 2801.43223.819%

New Calculation Method

Total ECM effort:27.575 GHz-days
DigitsB1CompleteFacMiss
201100012.9350.000%
25500001.16931.065%
302500000.07293.054%
3510000000.00399.671%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000039827.37
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers3639D54EDDF210C00.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T08:41:51Oliver KruseGTX-0
498231001038399003217
92BC817AF5FB66__no
2017-11-04T00:49:32kkmrkkblmbrbkc4.xlarge
498231001038399003217
92BC817AF5FB66__no
2019-08-18T06:07:36AN0NYM0USdory
498231001038399003217
659319980470633406174113
7BE2FADEC805F620no
2019-10-18T08:20:16qq1010903229School_Computers_5
498231001038399003217
659319980470633406174113
7BE2FADEC805F620no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-08-14T09:32:38+00:00