A119198 Triangular numbers composed of digits {3,6,9}.

3, 6, 36, 66, 666, 333336, 936396, 963966, 3966336, 3996939936, 99363693366, 63666996693966, 339666999336666, 633636693339936, 39696699699366996, 999699963339963966, 36936333639936696636, 6933666366666339963969663666, 393996396333933393393669696696, 399693363966633933999339639336

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053949, A119199. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119199(n)). - Tyler Busby, Mar 26 2023

Extensions

a(19)-a(20) from Tyler Busby, Mar 26 2023