OFFSET
1,2
COMMENTS
It is conjectured that this sequence is a permutation of the integers > 0.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..10001
EXAMPLE
The sequence starts with 1,3,6,12,10,8,17,26,... and we see indeed that the digits of:
{a(1); a(2)} have sum 1 + 3 = 4 (square);
{a(2); a(3)} have sum 3 + 6 = 9 (square);
{a(3); a(4)} have sum 6 + 1 + 2 = 9 (square);
{a(4); a(5)} have sum 1 + 2 + 1 + 0 = 4 (square);
{a(5); a(6)} have sum 8 + 1 + 7 = 16 (square);
{a(6); a(7)} have sum 1 + 7 + 2 + 6 = 16 (square);
etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Jean-Marc Falcoz and Eric Angelini, Jun 20 2019
STATUS
approved