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

1,1

Links

Table of n, a(n) for n=1..22.

Giovanni Resta, Tridigital Triangular Numbers

Formula

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

Crossrefs

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

Sequence in context: A212999 A103980 A101236 * A178337 A161589 A360966

Adjacent sequences: A119179 A119180 A119181 * A119183 A119184 A119185

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Extensions

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

Status

approved