A112991 a(n)=ceiling(2^(mod(2^n,n)+1)/3)-ceiling(2^mod(2^n,n)/3).

1, 0, 0, 1, 0, 1, 5, 1, 0, 85, 5, 1, 5, 1, 5, 85, 0, 1, 341, 1, 21845, 85, 5, 1, 21845, 43, 5, 22369621, 21845, 1, 5, 1, 0, 85, 5, 87381, 89478485, 1, 5, 85, 21845, 1, 1398101, 1, 21845, 43691, 5, 1, 21845, 357913941, 5592405, 85, 21845, 1, 89478485

Offset

0,7

Comments

A sequence of Jacobsthal numbers.

Links

Table of n, a(n) for n=0..54.

Crossrefs

Cf. A001045.

Sequence in context: A360176 A256042 A292604 * A346081 A137373 A220962

Adjacent sequences: A112988 A112989 A112990 * A112992 A112993 A112994

Keyword

easy,nonn

Author

Paul Barry, Oct 08 2005

Status

approved