is 2 1795921 - 1
has 540627 decimal digits
takes 0.097 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L849A5E2E1A9E357Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.545268.6567%500000150000000.10155.0571%16.646770.2418%1.5851%
PrimeNet2570.010763.1579%80001400000.00122.8162%0.011964.1955%1.0376%
GPU722610.171065.5738%80001300000.00121.4944%0.172266.0882%0.5145%
Difference+6+16.3742+3.0829%+492000+14870000+0.1003+3.5627%+16.4745+4.1535%+4.1535%

Known prime factors (2 factors, 183.1 bits, 0.01019394% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
179592140576800520177001357677372581.7471129693358454436508
22 × 137 × 3989 × 72797 × 7099087
2015-07-01727977099087475,0270.03580.0568
1795921318280825428907748276912703806331101.328886121453641078166235911
11 × 5981 × 36709 × 366905489681669
2015-02-25367093669054896816699.199e+101,572,4652,936,927

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
179592112914817562826069281538251164995687021070586523326
373431
56183.075
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:34:00Carsten Kossendeyleela950001638750---0.014--2.447%
2014-04-28T23:56:00ANONYMOUSManual testing145000145000---0.011--1.099%
2014-10-10T20:28:00Jocelyn LaroucheManual testing180739180739---0.014--1.234%
2015-01-13T02:42:00Jocelyn LaroucheManual testing271108271108---0.021--1.510%
2015-02-15T21:12:00Jocelyn LaroucheManual testing360842360842---0.028--1.724%
2015-02-21T13:42:00Jocelyn LaroucheManual testing396926396926---0.031--1.799%
2015-07-01T11:29:00alpertronManual testing50000015000000122581.7470.1010.1950.2035.057%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-19T13:16:00Architects Cubeda3_bu2260261--0.086--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.889--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.782 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:17.782 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.3230.024%
25500000.75247.133%
302500000.04695.474%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025517.58
50000500000030.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers849A5E2E1A9E357B0.097


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T17:39:15Oliver KruseGTX-1
4057680052017700135767737
3182808254289077482769127038063
56380AF9B75376CAno
2017-10-05T21:20:00Oliver KruseManual testing
4057680052017700135767737
3182808254289077482769127038063
56380AF9B75376__no
2017-11-11T03:28:31kkmrkkblmbrbkc4.xlarge
4057680052017700135767737
3182808254289077482769127038063
56380AF9B75376__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 396926 (P-1 stage 1)
B1 = 360842 (P-1 stage 1)
B1 = 271108 (P-1 stage 1)
B1 = 180739 (P-1 stage 1)
B1 = 95000, B2 = 1638750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
2110
Last modified: 2021-01-15T10:45:20+00:00