A278517 - OEIS

A278517

a(n) = smallest k for which A260731(k) = n.

0, 1, 4, 8, 9, 12, 16, 18, 20, 24, 25, 29, 32, 34, 36, 40, 43, 45, 48, 49, 52, 56, 58, 61, 64, 67, 70, 72, 74, 77, 80, 81, 84, 88, 90, 93, 96, 98, 100, 104, 106, 109, 113, 116, 120, 121, 125, 128, 130, 133, 136, 139, 142, 144, 146, 148, 152, 155, 157, 160, 162, 164, 168, 169, 172, 176, 178, 180, 184, 187, 190, 193, 196, 200

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OFFSET

0,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..11363

FORMULA

For all n >= 0, A260731(a(n)) = n.

PROG

(Scheme, with memoization-macro definec)

(definec (A278517 n) (if (zero? n) n (let loop ((k (A278517 (- n 1)))) (if (= (A260731 k) n) k (loop (+ 1 k))))))

CROSSREFS

Cf. A260731 (a left inverse), A278518 (first differences), A278519, A278521.