A119199 Numbers k such that the k-th triangular number contains only digits {3,6,9}.

2, 3, 8, 11, 36, 816, 1368, 1388, 2816, 89408, 445788, 11284236, 26064036, 35598783, 281768343, 1414001388, 8594921016, 117759639662036, 887689581254543, 894084295764816, 2581990177997183, 2696788235658743

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119198. See A119034 for a table of cross-references.