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LCM of terms in periodic part of continued fraction expansion of square root of -1+3^n.
12

%I #9 Sep 17 2021 16:00:40

%S 2,4,10,16,210,52,10764,160,840,484,78225840,1456,5729631692400,4372,

%T 932723933480442148565520,13120,202096081896183783466278120,39364,

%U 1505075187143521116689096930825555405884185492185368021027531191578186233461600

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

%H Chai Wah Wu, <a href="/A077635/b077635.txt">Table of n, a(n) for n = 1..30</a>

%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