A077635 LCM of terms in periodic part of continued fraction expansion of square root of -1+3^n.

2, 4, 10, 16, 210, 52, 10764, 160, 840, 484, 78225840, 1456, 5729631692400, 4372, 932723933480442148565520, 13120, 202096081896183783466278120, 39364, 1505075187143521116689096930825555405884185492185368021027531191578186233461600

Offset: 1

Author

Labos Elemer, Nov 13 2002

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..30

Crossrefs

Cf. A077624-A077635.

Programs

Mathematica

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