A236833 - OEIS

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A236833

a(n) = number of times n occurs in A234741.

1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 4, 1, 1, 2, 1, 1, 2, 1, 0, 1, 2, 1, 2, 2, 1, 1, 1, 4, 1, 1, 1, 1, 3, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 0, 4, 1, 2, 2, 0, 1, 3, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 4, 1, 1, 2, 1, 1, 1, 4, 1, 1, 3, 1, 2, 1, 1, 3, 1, 6, 1, 0

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OFFSET

0,6

COMMENTS

Number of distinct values k such that A234741(k) = n.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..8192

FORMULA

a(2n) = a(n).

This should also have a direct formula, mirroring the formula for A236853. Cf. also A236861.

PROG

(Scheme, counting cases empirically with a naive loop. A234742 gives an absolute upper bound for any inverse of A234741):

(define (A236833 n) (let ((u (A234742 n))) (let loop ((k n) (ntimes 0)) (cond ((> k u) ntimes) ((= (A234741 k) n) (loop (+ k 1) (+ ntimes 1))) (else (loop (+ k 1) ntimes))))))

CROSSREFS

A236834 gives the positions of zeros, A236835 the positions of terms larger than one, A236841 the positions of terms other than zero.

Cf. A234741, A236853, A236861.

Sequence in context: A277873 A032542 A107038 * A328511 A371245 A043278

Adjacent sequences: A236830 A236831 A236832 * A236834 A236835 A236836

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 31 2014

STATUS

approved