A076785 Let u(1)=u(2)=u(3)=1, u(n)=(2^floor(u(n-1)/2)+2^floor(u(n-2)/2)+1)/u(n-3) then a(n) = denominator of u(n).

1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1

Offset

1,7

Comments

Sequence is 24-periodic

Links

Table of n, a(n) for n=1..94.

Formula

Period is (1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1, 1, 1)

Crossrefs

Cf. A076784.

Sequence in context: A325174 A109956 A123319 * A110506 A114189 A200659

Adjacent sequences: A076782 A076783 A076784 * A076786 A076787 A076788

Keyword

frac,nonn

Author

Benoit Cloitre, Nov 24 2002

Status

approved