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A119100 Numbers n such that the n-th triangular number contains only digits {1,2,4}. 2
1, 6, 66, 666, 1686, 2913, 6666, 9406, 15761, 66666, 666666, 6666666, 47140518, 66666666, 206951318, 666666666, 1512753193, 6666666666, 9406509886, 66666666666, 297026066681, 666666666666, 6666666666666, 66666666666666 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119099. See A119034 for a table of cross-references.

Sequence in context: A156237 A119142 A119091 * A119176 A155630 A119125

Adjacent sequences:  A119097 A119098 A119099 * A119101 A119102 A119103

KEYWORD

nonn,base

AUTHOR

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

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.