A119159 Numbers k such that the k-th triangular number contains only digits {2,4,5}.

9, 10, 225, 714, 6714, 22114, 2119209, 2211449, 102523609, 942573334, 95336514049, 3333030289167658390

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

Next term exceeds 1.4*10^20.

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119158. See A119034 for a table of cross-references.

Extensions

a(12) from Max Alekseyev, Aug 19 2013