is 2 1771027 - 1
has 533133 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCCE73A55F568D0F2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.777868.6567%2475400866600000.55557.9608%17.333371.1519%2.4952%
PrimeNet2570.010863.1579%80001400000.00122.8088%0.012064.1927%1.0348%
GPU722610.173465.5738%80001200000.00111.4545%0.174666.0745%0.5007%
Difference+6+16.6043+3.0829%+2467400+86540000+0.5544+6.5062%+17.1587+5.0774%+5.0774%

Known prime factors (1 factor, 89.6 bits, 0.00505850% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17710279300640184742369579124574632789.587262577594377227720953
13921 × 39827 × 116471 × 4066229
2015-05-14116471406622979,876,7380.02610.0325

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T05:49:00Carsten Kossendeyleela950001615000---0.014--2.433%
2014-04-08T23:03:00Jocelyn LaroucheManual testing100000100000---0.008--0.889%
2014-05-09T20:31:00Jocelyn LaroucheManual testing136241136241---0.011--1.059%
2014-09-18T20:49:00Jocelyn LaroucheManual testing172482172482---0.014--1.202%
2015-05-14T05:21:00mikrMSI247540086660000122789.5870.5560.1921.1117.961%
2016-03-16T12:31:17alpertronManual testing5000001500000012-
skipped known factor: 930064018474236957912457463
--0.101--5.049%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-19T13:16:00Architects Cubedm1_tt260261--0.087--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.901--
2015-04-30T21:15:00snme2pm1Manual testing263264--1.109--
2015-04-30T21:15:00snme2pm1Manual testing264265--2.110--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.274 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.274 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025117.27


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computersCCE73A55F568D0F20.096


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T11:43:54Oliver KruseGTX-2
930064018474236957912457463
49B0F6C18171D8__no
2017-11-04T09:57:52kkmrkkblmbrbkc4.xlarge
930064018474236957912457463
49B0F6C18171D8__no


P-1 factor-bounds graph:
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1615000 (P-1 stage 2)
B1 = 172482 (P-1 stage 1)
B1 = 136241 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
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290
2100
Last modified: 2020-10-02T07:43:10+00:00