is 2 1487753 - 1
has 447859 decimal digits
takes 0.066 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5ED27D0526D7A23Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26840.063769.1176%14877531636528300.66867.5588%40.732371.4520%2.3343%
PrimeNet2570.012963.1579%65001000000.00082.3366%0.013764.0187%0.8608%
GPU722610.206565.5738%6000500000.00050.9462%0.207065.8995%0.3257%
Difference+7+39.8572+3.5439%+1481753+163602830+0.6680+6.6126%+40.5253+5.5525%+5.5525%

Known prime factors:
No known factors for M1487753

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000270000---0.002--0.828%
2011-12-05T03:18:00markrtiny2750006000000---0.038--3.430%
2015-03-24T11:42:00alpertronManual testing200000060000000---0.334--6.655%
2018-03-08T20:10:27Jocelyn Larouchelow 4M148775312000000012---0.515--7.222%
2018-03-29T11:32:57Jocelyn Larouchelow 4M148775314877530012---0.616--7.455%
2018-10-15T23:03:03Jocelyn Larouchelow 4M148775316365283012---0.669--7.559%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-14T00:00:00garyfuv4_computers21257--0.013--
2003-07-30T00:00:00ANONYMOUSv4_computers21258--0.026--
2016-02-23T16:28:34Mark RoseManual testing258260--0.077--
2010-05-06T21:30:00Architects Cubedm1_f2260261--0.103--
2016-02-23T16:28:34Mark RoseManual testing261262--0.206--
2011-05-28T03:14:00GrunwalderGIMPManual testing21263--1.073--
2016-02-23T16:28:34Mark RoseManual testing262263--0.660--
2015-04-06T21:14:00snme2pm1Manual testing263264--1.320--
2015-04-06T21:14:00snme2pm1Manual testing264265--2.511--
2015-09-24T15:27:48ramgeisManual testing265266--5.023--
2018-02-19T12:08:15TJAOIManual testing266267--10.05--
2020-05-28T00:31:20Gordon SpenceManual testing267268--20.09--


ECM factoring results:

Old Calculation Method

Total ECM effort:31.940 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:31.940 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.68718.509%
302500000.14586.503%
3510000000.01098.983%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025113.96
250000440000005017.98


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00garyfuv4_computers5ED27D0526D7A23D0.066
2015-07-19T16:38:00MadPooManual testing5ED27D0526D7A23D0.066


PRP results:
No PRP results for M1487753


P-1 factor-bounds graph:
B1 = 1487753, B2 = 163652830 (P-1 stage 2)
B1 = 1487753, B2 = 148775300 (P-1 stage 2)
B1 = 1487753, B2 = 120000000 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1487753 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 275000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-14T10:47:11+00:00