is 2 2175559 - 1
has 654909 decimal digits
takes 0.143 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBD8F7DCD27798FA4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26713.658167.1642%500000150000000.12305.1751%13.781068.8635%1.6993%
PrimeNet2580.017662.0690%100001800000.00182.8572%0.019563.1527%1.0838%
GPU722620.282464.5161%110001600000.00181.5681%0.284265.0726%0.5564%
Difference+5+13.3757+2.6481%+489000+14840000+0.1212+3.6070%+13.4968+3.7909%+3.7909%

Known prime factors (1 factor, 57.4 bits, 0.00263990% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
21755591944951250790649131857.43344700034584
23 × 3 × 43 × 569 × 76123
1999-01-29569761230.01020.00040.0007

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T13:46:03alpertronManual testing5000001500000012-
skipped known factor: 194495125079064913
--0.123--5.175%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers??57.433180.0010.2910.003
2000-04-05T00:00:00ANONYMOUSv4_computers??57.433180.0010.2910.003
2002-09-07T00:00:00ANONYMOUSv4_computers??57.433180.0010.2910.003


ECM factoring results:

Old Calculation Method

Total ECM effort:2.138 GHz-days
Estimated T-Level:1.200
DigitsB1CurvesCompleteFacMiss
201100024 / 1000.24078.568%
255000024 / 2800.08691.772%

New Calculation Method

Total ECM effort:2.138 GHz-days
Estimated T-Level:1.200
DigitsB1CompleteFacMiss
20110000.94638.848%
25500000.08791.629%
302500000.00699.448%


ECM Summary

B1B2factorcurvesGHz-days
500005000000171.453
50000675000070.684


Lucas-Lehmer results:
No L-L results for M2175559


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-09T16:15:41kkmrkkblmbrbkold
194495125079064913
88EE2DF74DC34E__no
2017-10-22T23:50:57Oliver KruseGTX-1
194495125079064913
88EE2DF74DC34E__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
2
250
260
270
280
290
2100
Last modified: 2022-08-08T05:56:21+00:00