OFFSET
1,3
COMMENTS
For n > 1, numbers that appear at least once in A007426.
LINKS
David A. Corneth, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Tetrahedral Number
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 14 2020
EXTENSIONS
More terms from David A. Corneth, Mar 22 2021
STATUS
approved