1,1

Antti Karttunen, Table of n, a(n) for n = 1..2047

Ratio a(n)/A257245(n) plotted with OEIS Plot2-script

a(n) = A257244(2n).

a(n) = A020639(A256393(2n)). [Equally, the smallest prime factor of A256393(2n).]

Other identities and observations:

For all n >= 1, a(n) <= A257245(n).

(Scheme, alternative definitions)

(define (A257246 n) (A257244 (+ n n)))

(define (A257246 n) (A020639 (A256393 (+ n n))))

Cf. A020639, A256393, A257244.

Cf. also A257245 (the other bisection), A257247 (gives the positions where both bisections have the same value).

Sequence in context: A173924 A307392 A046886 * A056206 A257245 A329245

Adjacent sequences: A257243 A257244 A257245 * A257247 A257248 A257249

nonn

Antti Karttunen, Apr 19 2015

approved