1,3

For n > 1, numbers that appear at least once in A007426.

David A. Corneth, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Tetrahedral Number

Cf. A000292, A007426, A085782, A265010.

Sequence in context: A215248 A310506 A310507 * A265010 A223961 A224391

Adjacent sequences: A334112 A334113 A334114 * A334116 A334117 A334118

nonn

Ilya Gutkovskiy, Apr 14 2020

More terms from David A. Corneth, Mar 22 2021

approved