A119182 Triangular numbers composed of digits {3,4,5}.

3, 45, 55, 435, 34453, 455535, 3355345, 3544453, 45453345, 334434453, 355444453, 3433345545, 4544333445, 5435334453, 35554444453, 44555453355, 3555544444453, 53443433535355, 355555444444453, 454555345444453, 5355435453444453, 35455445544444555

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A053937, A119183. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119183(n)).

Extensions

a(21)-a(22) from Tyler Busby, Mar 24 2023