A119197 Numbers k such that the k-th triangular number contains only digits {3,6,8}.

2, 3, 8, 11, 36, 816, 4211, 13163, 409483, 1128391, 2583163, 87935963, 356051588, 35683017483, 87964636836, 11566016486836, 36978011484891

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

Next term exceeds 1.4*10^16.

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119196. See A119034 for a table of cross-references.