A119213 - OEIS

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A119213

Numbers k such that the k-th triangular number contains only digits {4,6,8}.

2

3, 11, 36, 131, 411, 1331, 13331, 35963, 113916, 133331, 1333331, 13333331, 133333331, 1333333331, 13333333331, 31141241043, 133333333331, 1333333333331, 4110641475211, 13333333333331, 133333333333331

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..21.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119212. See A119034 for a table of cross-references.

Sequence in context: A333760 A100068 A260745 * A068644 A286318 A119054

Adjacent sequences: A119210 A119211 A119212 * A119214 A119215 A119216

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved