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A114022
Self-describing sequence: a(n) gives the number of integers in the sequence which are < a(n)^2.
0
0, 1, 3, 9, 10, 11, 12, 13, 14, 81, 100, 121, 144, 169, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236
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
Sequence in context: A080292 A273893 A228165 * A181862 A329560 A330296
KEYWORD
easy,nonn
AUTHOR
Eric Angelini, Feb 01 2006
STATUS
approved