is 2 1872943 - 1
has 563813 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0501DB93CB2087C8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.864868.6567%1388160138816000.16275.5237%16.027670.3880%1.7313%
PrimeNet2570.010363.1579%90001600000.00143.0300%0.011664.2742%1.1163%
GPU722610.164065.5738%100001500000.00141.6902%0.165466.1556%0.5819%
Difference+6+15.7008+3.0829%+1378160+13731600+0.1614+3.8335%+15.8622+4.2324%+4.2324%

Known prime factors (1 factor, 72.7 bits, 0.00388250% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
187294377629596891351563285272272.7172072396140495241
11 × 188399649135931
2018-01-0211188399649135931913.08807,4341,508,061

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-10T20:54:00markrtiny2750006000000---0.046--3.929%
2015-10-07T11:09:26Bruno Victal5820K-linux5000001500000012---0.101--5.083%
2016-11-13T17:04:47Jocelyn Larouchelow 4M600000600000---0.047--2.160%
2016-12-21T00:09:31Jocelyn Larouchelow 4M720000720000---0.057--2.325%
2017-01-03T05:50:41Jocelyn Larouchelow 4M864000864000---0.068--2.497%
2017-01-21T06:59:43Jocelyn Larouchelow 4M11568001156800---0.091--2.787%
2017-04-03T03:17:32Jocelyn Larouchelow 4M13881601388160012---0.163--5.524%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:56Mark RoseManual testing258260--0.062--
2010-04-11T14:32:00Architects CubedManual testing260261--0.082--
2016-02-23T16:28:56Mark RoseManual testing261262--0.164--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.852--
2016-02-23T16:28:56Mark RoseManual testing262263--0.524--
2015-05-08T22:25:00snme2pm1Manual testing263264--1.048--
2015-05-08T22:25:00snme2pm1Manual testing264265--1.995--
2015-09-11T08:33:00ramgeisManual testing265266--3.990--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.197 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.197 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5530.019%
25500000.77546.083%
302500000.04895.321%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000453.116
50000500000010.069
50000660000020516.01


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00Ethan O'Connorv4_computers0501DB93CB2087C80.102
2015-06-27T00:55:00MadPooManual testing0501DB93CB2087C80.102


PRP results:
dateuseridcompidcofactorsres64PRP
2018-01-04T03:20:41BloodERazorManual testing
7762959689135156328527
545F55D516ECF3__no
2018-01-04T10:51:32ATHwork
7762959689135156328527
545F55D516ECF3__no
2018-01-06T06:23:17Oliver KruseGTX-2
7762959689135156328527
545F55D516ECF3__no


P-1 factor-bounds graph:
B1 = 1388160, B2 = 13881600 (P-1 stage 2)
B1 = 1388160 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1156800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 600000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-07T10:31:17+00:00