A119145 - OEIS

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A119145

Numbers k such that the k-th triangular number contains only digits {1,6,9}.

2

1, 3, 11, 13, 36, 1386, 1411, 1543, 438433, 445241, 5685366, 19849388, 36385963, 154671711, 199808366, 1408518133, 3497461911, 184180138433, 1350308625456, 4892835517288, 11505747426366, 118253893522536, 447137831091711

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119144. See A119034 for a table of cross-references.

Sequence in context: A020451 A018450 A302304 * A168454 A181086 A274343

Adjacent sequences: A119142 A119143 A119144 * A119146 A119147 A119148

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved