A119194 Triangular numbers composed of digits {3,6,7}.

3, 6, 36, 66, 666, 76636, 333336, 36666766, 767673336, 3366367673376, 77337367776676667673367336

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(12) > 10^40. - Tyler Busby, Mar 29 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053947, A119195. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119195(n)). - Tyler Busby, Mar 29 2023