is 2 1752827 - 1
has 527654 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-L9A8AE775341BAD47double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.952068.6567%36422001234567890.80008.6369%17.752071.3638%2.7071%
PrimeNet2570.011063.1579%80001400000.00122.8033%0.012164.1907%1.0328%
GPU722610.175265.5738%80001100000.00111.4131%0.176366.0603%0.4865%
Difference+6+16.7767+3.0829%+3634200+123346789+0.7989+7.2237%+17.5757+5.3035%+5.3035%

Known prime factors (1 factor, 67.9 bits, 0.00387357% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17528272748126599056298761432167.89778391267337173
7 × 11198752476739
2015-12-2871119875247673932.94647,99589,641

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T16:01:00Carsten Kossendeyleela950001567500---0.014--2.411%
2014-04-08T23:00:00Jocelyn LaroucheManual testing100000100000---0.008--0.888%
2014-05-06T21:04:00Jocelyn LaroucheManual testing136618136618---0.011--1.059%
2014-09-16T20:52:00ANONYMOUSManual testing173236173236---0.014--1.202%
2015-04-24T23:12:00Squeeky_SquirrelP4_26001300003640000---0.025--3.107%
2015-06-30T22:30:00mikrMSI3642200123456789---0.800--8.637%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-20T15:50:00Architects Cubedi4l_1260261--0.088--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.911--
2016-02-23T16:28:50Mark RoseManual testing262263--0.560--
2015-05-13T21:10:00snme2pm1Manual testing263264--1.120--
2015-05-13T21:10:00snme2pm1Manual testing264265--2.132--
2015-09-05T13:49:00ramgeisManual testing265266--4.263--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.460 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:17.460 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025217.32
50000500000020.137


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computers9A8AE775341BAD470.095
2015-07-06T20:15:00MadPooManual testing9A8AE775341BAD470.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:32:42alpertronManual testing
274812659905629876143
BFD83D4F3FEAE4__no
2017-10-19T16:17:13Oliver KruseGTX-0
274812659905629876143
BFD83D4F3FEAE4__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 130000, B2 = 3640000 (P-1 stage 2)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 173236 (P-1 stage 1)
B1 = 136618 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-08-07T19:08:53+00:00