A257245 Odd bisection of A257244: a(n) = A257244(2n - 1).

2, 3, 3, 3, 3, 5, 5, 3, 3, 5, 7, 7, 7, 3, 19, 7, 5, 5, 7, 5, 19, 11, 13, 13, 23, 13, 11, 11, 61, 31, 13, 19, 43, 13, 7, 5, 61, 31, 23, 127, 7, 151, 19, 181, 13, 43, 31, 233, 13, 13, 7, 11, 19, 31, 59, 31, 31, 163, 41, 41, 113, 11, 19, 19, 409, 41, 41, 41, 19, 41, 113, 29, 167, 13, 17, 11, 179, 19, 19, 13, 5

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..2048

Formula

a(n) = A257244(2n - 1).

a(n) = A006530(A256393(2n - 1)). [Equally, the largest prime factor of A256393(2n-1).]

Other identities and observations:

For all n >= 1, a(n) >= A257246(n).

Prog

(Scheme, alternative definitions)
(define (A257245 n) (A257244 (+ n n -1)))
(define (A257245 n) (A006530 (A256393 (+ n n -1))))

Crossrefs

Cf. A006530, A256393, A257244.

Cf. also A257246 (the other bisection), A257247 (gives the positions where both bisections have the same value).

Sequence in context: A046886 A257246 A056206 * A329245 A155047 A369451

Adjacent sequences: A257242 A257243 A257244 * A257246 A257247 A257248

Keyword

nonn

Author

Antti Karttunen, Apr 19 2015

Status

approved