A119201 - OEIS

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A119201

Numbers k such that the k-th triangular number contains only digits {3,7,8}.

2

2, 12, 27, 132, 1332, 13332, 132572, 133332, 384132, 1333332, 4215052, 8646772, 13333332, 133333332, 1333333332, 13333333332, 133333333332, 1332504246772, 1333333333332, 2734350887427, 13329578968507, 13333333333332

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..22.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119200. See A119034 for a table of cross-references.

Sequence in context: A166151 A154149 A354780 * A164876 A225291 A211623

Adjacent sequences: A119198 A119199 A119200 * A119202 A119203 A119204

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved