OFFSET
1,2
COMMENTS
Conjecture: this sequence is a permutation of the positive integers.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10001
Rémy Sigrist, PARI program
Rémy Sigrist, Colored scatterplot of the first 100000 terms (where the color is function of the 2-adic valuation of n+1)
EXAMPLE
The first terms, arranged alongside a binary tree where each right child equals its parent plus its sibling, are:
|
.-------1-------.
| |
.---2---. .---3---.
| | | |
.-4-. .-6-. .-5-. .-8-.
| | | | | | | |
7 11 9 15 12 17 10 18
PROG
(PARI) \\ See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Apr 16 2024
STATUS
approved