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LCM of terms in periodic part of continued fraction expansion of square root of 1+3^n.
0

%I #4 Oct 15 2013 22:31:40

%S 2,6,30,18,90,54,106260,162,26040,486,341725784400,1458,

%T 6564164506066423389173040,4374,177815552218920,13122,

%U 2998833665484118393000638135815684490471025925316000,39366

%N LCM of terms in periodic part of continued fraction expansion of square root of 1+3^n.

%t Table[Apply[LCM, Last[ContinuedFraction[Sqrt[1+3^u]]]], {u, 1, 25}]

%Y Cf. A077624-A077635.

%K nonn

%O 1,1

%A _Labos Elemer_, Nov 13 2002