A096285 Denominator of the ratio of the preceding two terms.

1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1

Offset

3,3

Comments

The actual repeating sequence is 2,1,1/2,1/2,1,2,2,1,1/2,1/2,1,2...

Links

Table of n, a(n) for n=3..98.

Formula

Let a(1) = 1, a(2) = 2 then a(n) = a(n-2)/a(n-1) for n = 3, 4, 5... The sequence only posts the denominator of a(n).

Prog

(PARI) fibdiv(n) = { a = vector(1000); a[1] = 1; a[2] = 2; for(j=3, n, a[j] = a[j-1]/a[j-2]; print1(denominator(a[j])", ") ) }

Crossrefs

Sequence in context: A328615 A128016 A128017 * A328483 A321856 A175078

Adjacent sequences: A096282 A096283 A096284 * A096286 A096287 A096288

Keyword

nonn,frac

Author

Cino Hilliard, Jun 24 2004

Status

approved