is 2 1744231 - 1
has 525066 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-L244CEA3162094947double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.035568.6567%500000150000000.10155.0393%17.137070.2362%1.5795%
PrimeNet2570.011063.1579%80001400000.00122.8007%0.012264.1897%1.0318%
GPU722610.176165.5738%80001100000.00111.4117%0.177266.0598%0.4860%
Difference+6+16.8594+3.0829%+492000+14890000+0.1004+3.6276%+16.9598+4.1764%+4.1764%

Known prime factors (1 factor, 87.4 bits, 0.00501127% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17442312053469269759462735057094812787.40858864601929430870540
22 × 5 × 11 × 29 × 37 × 249362882019109
2008-07-213724936288201910932,516,2211,068,7071,996,047

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:34:47alpertronManual testing5000001500000012---0.101--5.039%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.382 GHz-days
Estimated T-Level:24.518
DigitsB1CurvesCompleteFacMiss
2011000253 / 1002.5307.865%
2550000253 / 2800.90440.447%

New Calculation Method

Total ECM effort:17.382 GHz-days
Estimated T-Level:24.518
DigitsB1CompleteFacMiss
20110009.7310.006%
25500000.90040.642%
302500000.05794.479%
3510000000.00399.735%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025317.38


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers244CEA31620949470.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:16:25alpertronManual testing
205346926975946273505709481
BB5047D397B3A3__no
2017-10-19T15:09:52Oliver KruseThreadripper
205346926975946273505709481
BB5047D397B3A3__no


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: 2020-06-22T09:22:21+00:00