is 2 5007881 - 1
has 1507523 decimal digits
takes 0.694 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP82B68F768ABABCC8verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273381.966868.4932%36000001200000001.99825.8485%383.965070.3358%1.8427%
PrimeNet2610.061362.2951%220004500000.00913.3141%0.070463.5447%1.2496%
GPU722651.456864.6154%340007000000.01412.4167%1.471065.4705%0.8551%
Difference+8+380.5100+3.8778%+3566000+119300000+1.9840+3.4319%+382.4940+4.8653%+4.8653%

Known prime factors (1 factor, 77.4 bits, 0.00154631% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
50078812046010132211870938617832477.43720427902861628211
569 × 821 × 43728880639
2021-10-17821437288806398,693.1478.84894.35

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2006-01-15T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.006%
2009-07-13T19:54:00harleeP4_260055000907500---0.020--1.005%
2014-11-10T23:29:00Jocelyn LaroucheManual testing6781767817---0.014--0.348%
2016-12-02T21:10:01Squeeky_Squirreli5-5250U_1600300000937500012---0.160--2.644%
2018-07-09T06:28:29mikrS054360000012000000012---1.998--5.849%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-10-17T23:45:04ATHec2-P_12500000250000027P+12477.4370.844


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:06Mark RoseManual testing21263--0.319--
2014-08-26T01:15:00krackerManual testing263264--0.392--
2014-08-29T00:05:00lycornManual testing264265--0.746--
2015-07-23T03:14:00snme2pm1Manual testing265266--1.492--
2016-05-14T03:02:04Gordon SpenceManual testing266267--2.984--
2017-10-22T18:44:16mikrManual testing267268--5.969--
2021-02-23T10:39:17TJAOIManual testing268269--11.94--
2021-04-01T10:42:20-Anonymous-Manual testing269270--23.88--
2021-04-01T10:42:20-Anonymous-Manual testing270271--47.75--
2021-04-03T10:35:53-Anonymous-Manual testing271272--95.50--
2021-04-04T19:23:42-Anonymous-Manual testing272273--191.0--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.593 GHz-days
Estimated T-Level:0.800
DigitsB1CurvesCompleteFacMiss
201100016 / 1000.16085.146%
255000016 / 2800.05794.436%

New Calculation Method

Total ECM effort:3.593 GHz-days
Estimated T-Level:0.800
DigitsB1CompleteFacMiss
20110000.53258.760%
25500000.04895.303%
302500000.00399.703%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897
50000650000071.696


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-07-12T00:00:00arnaudv4_computers69D37DFC6B2835__0.694


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-18T01:39:59ATHec2-PRPCFDC
204601013221187093861783
82B68F768ABABCC8no


P-1 factor-bounds graph:
B1 = 3600000, B2 = 120000000 (P-1 stage 2)
B1 = 3600000 (P-1 stage 1)
B1 = 2500000 (P+1 stage 1)
B1 = 300000, B2 = 9375000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 67817 (P-1 stage 1)
B1 = 55000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-18T01:39:59+00:00