is 2 61893751 - 1
has 18631876 decimal digits
takes 145.393 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
Actual27330.905364.3836%580000107300003.85924.1462%34.764565.8603%1.4767%
PrimeNet2703.860762.8571%260000120000003.06435.1415%6.924964.7668%1.9097%
GPU7227461.813464.8649%400000130000003.70073.7210%65.514266.1722%1.3074%
Difference-1-30.9082-0.4813%+180000-2270000+0.1584+0.4252%-30.7497-0.3119%-0.3119%

Known prime factors (1 factor, 94.5 bits, 0.00015272% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
61893751285292447721353577967725241912994.526230469508724195418345
34 × 5 × 43 × 71 × 4421 × 15269 × 2761217
2013-04-27152692761217118,484,2460.56160.9571

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-04-27T19:54:00Jwb52zClay580000107300002994.5263.859290.87.7184.146%


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--
2022-03-29T23:12:22LordJuliusManual testing262263--0.016--
2009-02-09T00:53:00Thomasegcj5mtv263264--0.032--
2009-02-09T17:00:00KlickitatAvengertsunami264265--0.060--
2009-02-10T03:36:00KlickitatAvengertsunami265266--0.121--
2009-07-22T09:40:00ANONYMOUS266267--0.241--
2009-07-26T02:02:00ANONYMOUS267268--0.483--
2009-07-27T19:47:00Sturle Sundedanzi.ifi268269--0.966--
2011-11-22T10:40:00S00030vd01269270--1.932--
2013-02-16T15:50:00XyzzyManual testing270271--3.864--
2013-02-18T04:33:00kdgehmanManual testing271272--7.727--
2013-02-18T04:33:00kdgehmanManual testing272273--15.45--


ECM factoring results:
No ECM results for M61893751


Lucas-Lehmer results:
No L-L results for M61893751


PRP results:
No PRP results for M61893751


P-1 factor-bounds graph:
B1 = 580000, B2 = 10730000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-29T23:12:22+00:00