A255336 a(n) = A005811(A255056(n)); After the initial zero, the first differences of A255056.

0, 2, 2, 2, 4, 2, 2, 4, 4, 4, 2, 2, 2, 4, 6, 4, 4, 4, 4, 2, 2, 2, 4, 6, 4, 6, 6, 4, 2, 4, 6, 4, 4, 4, 4, 2, 2, 2, 4, 6, 4, 6, 4, 4, 6, 6, 6, 6, 6, 4, 2, 4, 6, 4, 6, 6, 4, 2, 4, 6, 4, 4, 4, 4, 2, 2, 2, 4, 6, 4, 6, 4, 4, 6, 6, 6, 6, 4, 4, 6, 6, 6, 8, 6, 6, 6, 6, 6, 6, 4, 2, 4, 6, 4, 6, 4, 4, 6, 6, 6, 6, 6, 4, 2, 4, 6, 4, 6, 6, 4, 2, 4, 6, 4, 4, 4, 4, 2, 2

Offset

0,2

Comments

First differences of A255056, shifted once right (prepended with zero).

Links

Antti Karttunen, Table of n, a(n) for n = 0..8590

Formula

a(n) = A005811(A255056(n)).

a(0) = 0; and for n >= 1: a(n) = A255056(n) - A255056(n-1).

a(n) = 2*A255337(n).

Prog

(Scheme, two versions)
(define (A255336 n) (A005811 (A255056 n)))
(define (A255336 n) (if (zero? n) n (- (A255056 n) (A255056 (- n 1)))))

Crossrefs

First differences of A255056.

Terms of A255337 doubled.

Cf. A005811.

Analogous sequence: A213712.

Sequence in context: A066671 A159802 A329586 * A292929 A049627 A278223

Adjacent sequences: A255333 A255334 A255335 * A255337 A255338 A255339

Keyword

nonn

Author

Antti Karttunen, Feb 21 2015

Status

approved