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A261094 Left inverse of A219640: If n = A219640(k) for some k, then a(n) = k, otherwise zero. 4
0, 1, 2, 0, 3, 4, 0, 5, 6, 7, 0, 0, 8, 9, 10, 0, 11, 12, 0, 0, 13, 14, 15, 0, 16, 17, 0, 18, 19, 20, 0, 0, 0, 21, 22, 23, 0, 24, 25, 0, 26, 27, 28, 0, 0, 29, 30, 31, 0, 32, 33, 0, 0, 0, 34, 35, 36, 0, 37, 38, 0, 39, 40, 41, 0, 0, 42, 43, 44, 0, 45, 46, 0, 0, 47, 48, 49, 0, 50, 51, 0, 52, 53, 54, 0, 0, 0, 0, 55, 56, 57, 0, 58, 59, 0, 60, 61, 62 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..10946

FORMULA

a(n) = A261092(n) * A261093(n).

Other identities. For all n >= 0:

a(A219640(n)) = n.

PROG

(Scheme) (define (A261094 n) (* (A261092 n) (A261093 n)))

CROSSREFS

Cf. A219640, A261092, A261093.

Sequence in context: A181289 A229032 A117909 * A091538 A013584 A307320

Adjacent sequences:  A261091 A261092 A261093 * A261095 A261096 A261097

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 08 2015

STATUS

approved

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Last modified January 23 10:36 EST 2020. Contains 331171 sequences. (Running on oeis4.)