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A119213 Numbers n such that the n-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 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

G. Resta, Tridigital Triangular Numbers

CROSSREFS

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

Sequence in context: A017937 A017938 A100068 * A068644 A119054 A119090

Adjacent sequences:  A119210 A119211 A119212 * A119214 A119215 A119216

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), May 10 2006

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.