A119231 Numbers k such that the k-th triangular number contains only digits {6,7,8}.

3, 11, 12, 36, 116, 132, 1163, 1332, 13332, 133332, 1333332, 3941747, 11737707, 13333332, 133333332, 1333333332, 13333333332, 133333333332, 416381478667, 1254414499811, 1333333333332, 4187521168132, 11635005525283

Offset

1,1

Links

Table of n, a(n) for n=1..23.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119230. See A119034 for a table of cross-references.

Sequence in context: A055046 A141386 A254220 * A177335 A031449 A305859

Adjacent sequences: A119228 A119229 A119230 * A119232 A119233 A119234

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved