A261094 Left inverse of A219640: If n = A219640(k) for some k, then a(n) = k, otherwise zero.

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

Offset: 0

Author

Antti Karttunen, Aug 08 2015

Keywords

• nonn

Links

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

Crossrefs

Cf. A219640, A261092, A261093.

Programs

Scheme

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

Formula

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

Other identities. For all n >= 0:

a(A219640(n)) = n.