A352417 Inverse permutation to A352416.

0, 1, 3, 4, 2, 9, 10, 12, 13, 5, 6, 7, 27, 28, 30, 31, 11, 36, 37, 39, 40, 14, 15, 16, 18, 19, 21, 22, 8, 81, 82, 84, 85, 29, 90, 91, 93, 94, 32, 33, 34, 108, 109, 111, 112, 38, 117, 118, 120, 121, 41, 42, 43, 45, 46, 48, 49, 17, 54, 55, 57, 58, 20, 63, 64, 66

Offset

0,3

Links

Rémy Sigrist, Table of n, a(n) for n = 0..10000

Index entries for sequences that are permutations of the natural numbers

Example

A352416(7) = 11, so a(11) = 7.

Prog

(PARI) a(n) = { my (p=[1, 2]); for (k=2, oo, if (n<=p[k], my (v=0, d); while (n, v+=3^k*d=n\p[k]; if (d==2, v/=3); n-=d*p[k]; k--); return (v/3), p = concat(p, 2*p[k]+p[k-1]))) }

Crossrefs

Cf. A000129, A317204, A352416.

Sequence in context: A075593 A145421 A338245 * A286681 A019474 A366896

Adjacent sequences: A352414 A352415 A352416 * A352418 A352419 A352420

Keyword

nonn,base

Author

Rémy Sigrist, Mar 15 2022

Status

approved