A119223 - OEIS

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A119223

Numbers k such that the k-th triangular number contains only digits {5,6,9}.

2

3, 10, 11, 34, 36, 105, 109, 114, 3363, 13834, 438109, 1383471, 3622034, 10954411, 11537388, 33336636, 105517363, 141114114, 3333366765, 3333333366663363, 333645229535671903

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

OFFSET

1,1

LINKS

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

Giovanni Resta, Tridigital Triangular Numbers.

CROSSREFS

Cf. A000217, A119222. See A119034 for a table of cross-references.

Sequence in context: A357555 A078306 A136815 * A119165 A119080 A119221

Adjacent sequences: A119220 A119221 A119222 * A119224 A119225 A119226

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

a(21) from Tyler Busby, Mar 31 2023

STATUS

approved