is 2 1736927 - 1
has 522868 decimal digits
takes 0.094 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE3A01EF44DD8B9C5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.107268.6567%500000150000000.10155.0368%17.208770.2354%1.5787%
PrimeNet2570.011163.1579%80001400000.00122.7985%0.012264.1889%1.0310%
GPU722610.176965.5738%80001100000.00111.4105%0.177966.0593%0.4856%
Difference+6+16.9303+3.0829%+492000+14890000+0.1004+3.6263%+17.0307+4.1761%+4.1761%

Known prime factors (1 factor, 61.2 bits, 0.00352249% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
173692726178381580018552631961.183753583241553
3 × 103 × 2438780717
2008-07-1510324387807170.309010.45219.521

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:33:47alpertronManual testing5000001500000012---0.101--5.037%


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


ECM factoring results:

Old Calculation Method

Total ECM effort:17.787 GHz-days
Estimated T-Level:24.625
DigitsB1CurvesCompleteFacMiss
2011000259 / 1002.5907.405%
2550000259 / 2800.92539.588%

New Calculation Method

Total ECM effort:17.787 GHz-days
Estimated T-Level:24.625
DigitsB1CompleteFacMiss
20110009.9620.005%
25500000.92239.784%
302500000.05894.352%
3510000000.00399.729%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025917.79


Lucas-Lehmer results:
No L-L results for M1736927


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:16:13alpertronManual testing
2617838158001855263
90D221098782F9__no
2017-10-19T11:29:08Oliver KruseGTX-3
2617838158001855263
90D221098782F9__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
109
1010
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2020-06-15T09:59:42+00:00