OFFSET
1,2
COMMENTS
This is conjectured to be a permutation of the positive integers (see the Crossrefs section).
LINKS
Carole Dubois, Table of n, a(n) for n = 1..14999
EXAMPLE
The process begins like this:
Initially S = 1 is the smallest missing number, so we have:
S = 1, 3, 9, 27, 81, stop (because 81 contains S), S = 2, 6, 18, 54, 162, stop, S = 4, 12, 36, 108, 324, stop, S = 5, 15, stop, S = 7, 21, 63, 189, 567, ...
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Jan 23 2020
STATUS
approved