A119233 Numbers k such that the k-th triangular number contains only digits {6,7,9}.

3, 11, 36, 36817576, 365512507857054543

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

Next term exceeds 4.4*10^17.

Links

• G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119232. See A119034 for a table of cross-references.

Extensions

365512507857054543 from Max Alekseyev, Mar 10 2009