A119173 Numbers k such that the k-th triangular number contains only digits {2,6,7}.

3, 11, 23, 36, 123, 3651, 394123, 2307651, 74534188, 394392348, 3639430251, 1159885996348

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

Next term exceeds 4.4*10^18.

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119172. See A119034 for a table of cross-references.

Extensions

Lower bound for further terms updated by Max Alekseyev, May 07 2009