A119196 Triangular numbers composed of digits {3,6,8}.

3, 6, 36, 66, 666, 333336, 8868366, 86638866, 83838368386, 636633688636, 3336366833866, 3866366838336666, 63386366836686666, 636638868363883336386, 3868888666888666363866, 66886368686886866888888866, 683686666688383838366383386

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

a(18) > 10^40. - Tyler Busby, Mar 24 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A058466, A119197. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119197(n)). - Tyler Busby, Mar 24 2023

Extensions

a(16)-a(17) from Tyler Busby, Mar 24 2023