A300855 Inverse of Knuth's base-5 based twisted permutation A220952 of the nonnegative integers.

0, 1, 2, 3, 4, 17, 16, 15, 14, 5, 18, 11, 12, 13, 6, 19, 10, 9, 8, 7, 20, 21, 22, 23, 24, 97, 96, 95, 94, 85, 48, 49, 50, 51, 84, 47, 54, 53, 52, 83, 46, 55, 56, 57, 82, 37, 36, 35, 34, 25, 98, 91, 92, 93, 86, 43, 66, 65, 64, 79, 44, 61, 62, 63, 80, 45, 60, 59, 58, 81

Offset: 0

Author

M. F. Hasler, Mar 13 2018

Keywords

• nonn
• look

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..15624

Crossrefs

See A220952 for the inverse permutation, A300857 and its inverse A300856 for the base-7 variant.

Programs

PARI

concat(0,Vec(vecsort(A220952,,1))) \\ where A220952 is a vector of some N initial terms of that sequence without the leading a(0) = 0 (use ...[^1] to exclude the first element if needed) and such that these N values contain exactly all integers from 1 to N, e.g., N = 120.

Formula

A220952(9) = 5, therefore a(5) = 9.