is 2 61897621 - 1
has 18633041 decimal digits
takes 145.402 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27330.903464.3836%5800005800001.97561.7892%32.878965.0208%0.6372%
PrimeNet2703.860462.8571%260000120000003.06435.1415%6.924764.7668%1.9097%
GPU7227461.809664.8649%400000130000003.70073.7210%65.510366.1722%1.3074%
Difference-1-30.9062-0.4813%+180000-12420000-1.7252-1.9318%-32.6314-1.1514%-1.1514%

Known prime factors (1 factor, 75.5 bits, 0.00012200% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
61897621539208949924921889173512375.513435565164875175
33 × 52 × 17 × 89 × 211 × 373 × 5419
2013-04-283735419173.790.00220.0026

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-04-28T08:59:00Jwb52zClay5800005800002375.5131.976290.83.9511.789%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-06-17T00:00:00ANONYMOUSv4_computers21259--0.001--
2003-12-13T00:00:00ANONYMOUSv4_computers21260--0.002--
2004-04-20T00:00:00ANONYMOUSv4_computers21262--0.010--
2022-03-29T23:12:23LordJuliusManual testing262263--0.016--
2009-02-09T04:18:00Sturle Sundegooch.ifi263264--0.032--
2009-02-12T23:07:00ANONYMOUS2941server2264265--0.060--
2009-02-19T12:33:00Atanas TodorovAsus_Eee_PC1000H265266--0.121--
2009-02-27T07:09:00Atanas TodorovAsus_Eee_PC1000H266267--0.241--
2009-02-28T15:06:00ANONYMOUSquad267268--0.483--
2009-07-16T21:54:00Misha O268269--0.966--
2012-04-28T22:41:00XyzzyManual testing269270--1.932--
2012-04-28T22:41:00XyzzyManual testing270271--3.863--
2013-02-12T23:40:00Jerry HallettManual testing271272--7.727--
2013-02-19T12:20:00RichD0Manual testing272273--15.45--


ECM factoring results:
No ECM results for M61897621


Lucas-Lehmer results:
No L-L results for M61897621


PRP results:
No PRP results for M61897621


P-1 factor-bounds graph:
B1 = 580000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-29T23:12:23+00:00