1,1

Which composites are missing apart from 8, 9 and 27? See comment at A225648.

Table of n, a(n) for n=1..66.

(Scheme with Antti Karttunen's IntSeq-library):

(define A225649 (MATCHING-POS 1 1 (lambda (i) (> (gcd (A000793 i) i) 1))))

Cf. A225648 (complement), A225651 (from n>1 onward is a subset).

Cf. A225650, A225640.

Sequence in context: A180242 A187966 A280584 * A225651 A191149 A122907

Adjacent sequences: A225646 A225647 A225648 * A225650 A225651 A225652

nonn

Antti Karttunen, May 13 2013

approved