OFFSET
0,3
COMMENTS
Earliest strictly increasing sequence satisfying a(a(n))=a(n)^2. - Benoit Cloitre, May 26 2021
EXAMPLE
There are 0 integer in the sequence which are < 0^2; there is only 1 integer < 1^2 (this is "0", which is < 1); there are 3 integers < 3^2 (they are 0,1,3 which are < 9); there are 9 integers < 81 (0,1,3,9,10,11,12,13,14); etc.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Eric Angelini, Feb 01 2006
STATUS
approved