OFFSET
1,2
COMMENTS
The sequence is a permutation of the positive integers.
LINKS
Carole Dubois, Table of n, a(n) for n = 1..10000
Eric Angelini, Une merveille avec a(2n), Feb 8, 2022, personal blog (in French).
EXAMPLE
This sequence : 1, 2, 3, 6, 4, 11, 5, 28, 7, 68, 8, 13, 9, 288, 10, 14, 12 ...
Even dig. sums: 0, 2, 2, 8, 12, 12, 12, 22, 22, 36, 44, 44, 44, 62, 62, 66, 68 ...
Odd dig. sums : 1, 1, 4, 4, 4, 6, 11, 11, 18, 18, 18, 22, 31, 31, 32, 33, 34 ...
x x x x x x x x ...
We see that 2 is twice 1, 8 is twice 4, 12 is twice 6, 22 is twice 11, 36 is twice 18, etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Feb 09 2022
STATUS
approved