A119212 Triangular numbers composed of digits {4,6,8}.

6, 66, 666, 8646, 84666, 886446, 88864446, 646686666, 6488484486, 8888644446, 888886444446, 88888864444446, 8888888644444446, 888888886444444446, 88888888864444444446, 484888446864684484446, 8888888888644444444446, 888888888886444444444446

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053959, A119213. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119213(n)). - Michel Marcus, Mar 27 2023

Extensions

a(18) from Tyler Busby, Mar 28 2023