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A376685
a(n) is the unique k such that A376637(k) is the reversal of A376637(n).
3
1, 2, 3, 5, 4, 6, 9, 10, 7, 8, 13, 15, 11, 16, 12, 14, 19, 21, 17, 23, 18, 24, 20, 22, 27, 28, 25, 26, 38, 34, 40, 33, 32, 30, 39, 37, 36, 29, 35, 31, 44, 43, 42, 41, 48, 47, 46, 45, 54, 53, 56, 55, 50, 49, 52, 51, 59, 60, 57, 58, 62, 61, 64, 63, 67, 68, 65
OFFSET
1,2
COMMENTS
This sequence is a self-inverse permutation of the positive integers.
FORMULA
A376637(a(n)) = A004086(A376637(n)).
EXAMPLE
The first terms, alongside the corresponding terms of A376637, are:
n a(n) A376637(n) A376637(a(n))
-- ---- ---------- -------------
1 1 1 1
2 2 2 2
3 3 11 11
4 5 12 21
5 4 21 12
6 6 22 22
7 9 112 211
8 10 122 221
9 7 211 112
10 8 221 122
11 13 1121 1211
12 15 1122 2211
13 11 1211 1121
14 16 2122 2212
15 12 2211 1122
16 14 2212 2122
PROG
(PARI) \\ See Links section.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Oct 01 2024
STATUS
approved