is 2 5551801 - 1
has 1671259 decimal digits
takes 0.877 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6381AEC59BBC1BC1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2751,378.275069.3333%20000001120000001.83034.6334%1,380.105270.7542%1.4209%
PrimeNet2620.110762.9032%240005500000.01213.1662%0.122764.0778%1.1746%
GPU722662.660165.1515%340007000000.01612.1570%2.676265.9032%0.7517%
Difference+9+1,375.6149+4.1818%+1966000+111300000+1.8142+2.4764%+1,377.4290+4.8510%+4.8510%

Known prime factors:
No known factors for M5551801

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-07-25T00:00:00ANONYMOUSv4_computers25000156250---0.007--0.326%
2010-11-25T04:04:00Squeeky_SquirrelP4_2600650001121250---0.028--0.870%
2013-05-19T12:14:00Squeeky_SquirrelP4_26001750003937500---0.087--1.574%
2021-10-19T13:29:41Architects Cubedburrow2000000112000000---1.830--4.633%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:10Mark RoseManual testing21262--0.111--
2009-04-23T19:20:00GrunwalderGIMPManual testing262263--0.177--
2012-06-27T11:26:00dbaughManual testing263264--0.354--
2012-07-07T12:36:00dbaughManual testing264265--0.673--
2012-07-11T04:38:00dbaughManual testing265266--1.346--
2012-07-11T04:38:00dbaughManual testing266267--2.692--
2012-08-12T07:06:00dbaughManual testing267268--5.384--
2012-08-15T08:42:00dbaughManual testing268269--10.77--
2012-09-29T08:21:00dbaughManual testing269270--21.54--
2012-10-19T00:19:00dbaughManual testing270271--43.07--
2012-11-24T17:03:00dbaughManual testing271272--86.14--
2013-05-06T06:53:00dbaughManual testing272273--172.3--
2013-09-09T04:53:00dbaughManual testing273274--344.6--
2013-12-09T01:19:00dbaughManual testing274275--689.2--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.122 GHz-days
Estimated T-Level:0.650
DigitsB1CurvesCompleteFacMiss
201100013 / 1000.13087.752%
255000013 / 2800.04695.455%

New Calculation Method

Total ECM effort:3.122 GHz-days
Estimated T-Level:0.650
DigitsB1CompleteFacMiss
20110000.41965.747%
25500000.03896.281%
302500000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000133.122


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-09-08T00:00:00ANONYMOUSv4_computers6381AEC59BBC1BC10.877


PRP results:
No PRP results for M5551801


P-1 factor-bounds graph:
B1 = 2000000, B2 = 112000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 175000, B2 = 3937500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 65000, B2 = 1121250 (P-1 stage 2)
B1 = 65000 (P-1 stage 1)
B1 = 25000, B2 = 156250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-19T13:29:41+00:00