A119232 Triangular numbers composed of digits {6,7,9}.

6, 66, 666, 677766969666676, 66799696699976679697696799766996696

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(6) > 10^40. - Tyler Busby, Mar 29 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053973, A119233. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119233(n)). - Michel Marcus, Mar 27 2023

Extensions

a(5) from Max Alekseyev, Mar 10 2009