A119061 Triangular numbers composed of digits {0,3,5}.

3, 55, 300, 3003, 5050, 500500, 50005000, 5000050000, 33050333550, 500000500000, 3505500530535, 50000005000000, 53555035005300, 355300503533550, 5000000050000000, 50035505550330300, 300555503500333305, 500000000500000000, 50000000005000000000

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119062. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119062(n)). - Michel Marcus, Mar 14 2023

Extensions

a(17)-a(19) from Tyler Busby, Mar 14 2023