is 2 5049887 - 1
has 1520168 decimal digits
takes 0.700 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5C2E2A78C0CC7296double-checked
PRP73D41841F2374805verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272189.377268.0556%30000094500000.16052.9512%189.537768.9983%0.9427%
PrimeNet2610.060862.2951%220005000000.00973.4039%0.070563.5785%1.2834%
GPU722651.444764.6154%340007000000.01412.4201%1.458965.4717%0.8563%
Difference+7+187.9325+3.4402%+266000+8750000+0.1464+0.5311%+188.0789+3.5266%+3.5266%

Known prime factors (1 factor, 103.9 bits, 0.00205778% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
50498871912670946060341633171823610383132103.9151893775985542192957161045
3 × 5 × 37 × 181 × 2531 × 5479 × 89989 × 15106859
2021-10-3189989151068592.736e+100.18250.3090

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00hitchcockv4_computers30000465000---0.011--0.787%
2009-08-09T22:12:00harleeP4_260055000907500---0.020--1.154%
2017-03-07T07:00:14Squeeky_Squirreli5-5250U_1600300000945000012---0.160--2.951%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-10-31T00:38:06ATH5960X25000008750000027P-132103.9151.676


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-01-26T00:00:00ANONYMOUSv4_computers21261--0.061--
2016-02-23T16:39:07Mark RoseManual testing261263--0.255--
2014-12-17T21:25:00VictordeHollanderManual testing263264--0.389--
2014-12-17T21:25:00VictordeHollanderManual testing264265--0.740--
2015-07-30T21:28:00snme2pm1Manual testing265266--1.480--
2016-05-19T12:46:47Gordon SpenceManual testing266267--2.960--
2018-06-11T12:29:27ramgeisManual testing267268--5.919--
2020-12-21T16:08:26TJAOIManual testing268269--11.84--
2021-04-01T12:54:17-Anonymous-Manual testing269270--23.68--
2021-04-01T12:54:17-Anonymous-Manual testing270271--47.35--
2021-04-03T17:56:54-Anonymous-Manual testing271272--94.71--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-14T00:00:00Kimon Berlinv4_computers5C2E2A78C0CC72960.700
2000-09-08T00:00:00curtiscv4_computers5C2E2A78C0CC72960.700


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-31T02:41:47ATHec2-PRPCFDC
19126709460603416331718236103831
73D41841F2374805no


P-1 factor-bounds graph:
B1 = 2500000, B2 = 87500000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 300000, B2 = 9450000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
B1 = 30000, B2 = 465000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
103
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108
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
261
250
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270
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2100
2110
Last modified: 2021-10-31T02:41:47+00:00