A077633 LCM of terms in periodic part of continued fraction expansion of square root of -1+2^n.

1, 2, 4, 6, 30, 14, 462, 30, 924, 62, 360, 126, 88623545610600, 254, 5364840, 510, 214057116, 1022, 473045752778491241949600, 2046, 3968969477588889464597306400, 4094, 16579321550270765937400453704000

Offset

1,2

Links

Table of n, a(n) for n=1..23.

Mathematica

Table[Apply[LCM, Last[ContinuedFraction[Sqrt[ -1+2^u]]]], {u, 1, 25}]

Crossrefs

Cf. A077624-A077635.

Sequence in context: A204661 A284919 A279419 * A006933 A046847 A339759

Adjacent sequences: A077630 A077631 A077632 * A077634 A077635 A077636

Keyword

nonn

Author

Labos Elemer, Nov 13 2002

Status

approved