is 2 4983647 - 1
has 1500228 decimal digits
takes 0.691 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2BA528BD27043DE7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272191.894368.0556%19000050825000.09182.3719%191.986168.8132%0.7577%
PrimeNet2610.061662.2951%220004500000.00913.3114%0.070763.5437%1.2486%
GPU722651.463964.6154%340007000000.01412.4147%1.478165.4698%0.8544%
Difference+7+190.4304+3.4402%+156000+4382500+0.0776-0.0428%+190.5080+3.3434%+3.3434%

Known prime factors:
No known factors for M4983647

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-06-11T00:00:00ANONYMOUSv4_computers25000275000---0.008--0.624%
2011-07-22T04:08:00harleeP4_260060000990000---0.022--1.209%
2016-06-18T16:04:59Squeeky_SquirrelP4_260019000050825006---0.092--2.372%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-08T00:00:00ANONYMOUSv4_computers21261--0.062--
1998-08-16T00:00:00ANONYMOUSv4_computers21261--0.062--
2009-12-03T22:55:00markroldgamer261262--0.062--
2011-11-13T15:27:00GrunwalderGIMPManual testing21263--0.320--
2016-02-23T16:39:06Mark RoseManual testing262263--0.197--
2014-12-26T11:20:00VictordeHollanderManual testing263264--0.394--
2014-12-26T11:20:00VictordeHollanderManual testing264265--0.750--
2015-07-31T01:17:00snme2pm1Manual testing265266--1.499--
2017-05-21T19:23:16YxinityManual testing266267--2.999--
2018-06-05T09:54:14ramgeisManual testing267268--5.998--
2021-02-08T11:47:29TJAOIManual testing268269--12.00--
2021-04-23T17:19:43-Anonymous-Manual testing269270--23.99--
2021-04-24T17:39:58-Anonymous-Manual testing270271--47.98--
2021-04-25T12:55:05-Anonymous-Manual testing271272--95.96--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.895 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.895 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.895


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-09-13T00:00:00ANONYMOUSv4_computers2BA528BD27043DE70.691
2001-10-20T00:00:00Ice_9v4_computers2BA528BD27043DE70.691


PRP results:
No PRP results for M4983647


P-1 factor-bounds graph:
B1 = 190000, B2 = 5082500 (P-1 stage 2)
B1 = 190000 (P-1 stage 1)
B1 = 60000, B2 = 990000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 275000 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2021-04-25T12:55:05+00:00