is 2 1750681 - 1
has 527008 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-L28E9B3236C8D00E0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.972868.6567%500000150000000.10155.0416%17.074370.2369%1.5802%
PrimeNet2570.011063.1579%80001400000.00122.8027%0.012264.1905%1.0326%
GPU722610.175565.5738%80001100000.00111.4128%0.176566.0601%0.4864%
Difference+6+16.7973+3.0829%+492000+14890000+0.1004+3.6288%+16.8977+4.1768%+4.1768%

Known prime factors (2 factors, 136.0 bits, 0.00777065% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1750681284132603019168651612064.6238114916510180
22 × 33 × 5 × 15027623167
2009-06-2527150276231672.254864.405120.29
175068131506856596079774006812271.416899845734205140
22 × 3 × 5 × 691 × 839 × 25868831
2020-06-2083925868831411.450.11090.2071

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
17506818952125177595809741623148706134074657464141136.039
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:29:16alpertronManual testing5000001500000012---0.101--5.042%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.596 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:17.596 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110008.2580.026%
25500000.74647.409%
302500000.04695.508%
3510000000.00299.790%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025317.39
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00bezaharv4_computers28E9B3236C8D00E00.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T06:31:29Oliver KruseGTX-0
28413260301916865161
2E3B87E6335BE0__no
2017-11-03T18:25:45ATHec2-1xf
28413260301916865161
2E3B87E6335BE0__no
2020-06-20T02:15:27CrypticCluecruncher
28413260301916865161
3150685659607977400681
2C3D3AFA70E93BFFno
2020-06-21T08:19:44Luigi Morelli9800X
28413260301916865161
3150685659607977400681
2C3D3AFA70E93BFFno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2020-07-27T11:05:04+00:00