A119129 Numbers k such that the k-th triangular number contains only digits {1,4,8}.

1, 478, 1541, 4866, 988113, 4216353, 15155321, 16977521, 983990258, 531956543121, 544826911685686, 16843306612090658, 127392946577229686

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, A119128. See A119034 for a table of cross-references.

Extensions

a(12)-a(13) from Max Alekseyev, Aug 16 2013