is 2 1742809 - 1
has 524638 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-L3D44780C1F527859double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.049468.6567%500000150000000.10155.0388%17.150970.2361%1.5793%
PrimeNet2570.011063.1579%80001400000.00122.8003%0.012264.1896%1.0317%
GPU722610.176365.5738%80001100000.00111.4115%0.177366.0597%0.4859%
Difference+6+16.8732+3.0829%+492000+14890000+0.1004+3.6274%+16.9736+4.1764%+4.1764%

Known prime factors (1 factor, 65.6 bits, 0.00376563% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1742809570065763459506445132065.62816354797440784
24 × 3 × 11 × 30974995153
2008-07-2016309749951534.4312132.75247.94

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:34:34alpertronManual testing5000001500000012---0.101--5.039%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.312 GHz-days
Estimated T-Level:24.500
DigitsB1CurvesCompleteFacMiss
2011000252 / 1002.5207.945%
2550000252 / 2800.90040.592%

New Calculation Method

Total ECM effort:17.312 GHz-days
Estimated T-Level:24.500
DigitsB1CompleteFacMiss
20110009.6920.006%
25500000.89740.787%
302500000.05794.500%
3510000000.00399.736%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025217.31


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers3D44780C1F5278590.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:16:14alpertronManual testing
57006576345950644513
E934B77E343525__no
2017-10-19T14:22:23Oliver KruseThreadripper
57006576345950644513
E934B77E343525__no


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: 2020-06-29T11:36:52+00:00