0,5

Number of nonzero terms of A001563 <= n.

Each n occurs A001564(n) times.

Antti Karttunen, Table of n, a(n) for n = 0..4320

(Scheme) (define (A258198 n) (let loop ((k 1) (f 1)) (if (> (* k f) n) (- k 1) (loop (+ k 1) (* (+ k 1) f)))))

Cf. A001563, A001564, A084556, A084557, A256450, A258199.

Sequence in context: A130635 A107609 A243113 * A204562 A135660 A163858

Adjacent sequences: A258195 A258196 A258197 * A258199 A258200 A258201

nonn

Antti Karttunen, May 23 2015

approved