A119179 Numbers k such that the k-th triangular number contains only digits {2,7,8}.

7, 12, 67, 132, 667, 1287, 1332, 4067, 6667, 13287, 13332, 66667, 75932, 133287, 133332, 666667, 1333287, 1333332, 6666667, 13333287, 13333332, 21395692, 23335692, 23335932, 66666667, 124280507, 124721912, 133333287, 133333332

Offset

1,1

Links

Table of n, a(n) for n=1..29.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119178. See A119034 for a table of cross-references.

Sequence in context: A083335 A372734 A358782 * A121983 A177169 A275005

Adjacent sequences: A119176 A119177 A119178 * A119180 A119181 A119182

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved