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A119104 Numbers n such that the n-th triangular number contains only digits {1,2,6}. 2
1, 3, 6, 11, 36, 66, 111, 651, 666, 1563, 1588, 5766, 6651, 6666, 15563, 15888, 36366, 65766, 66651, 66666, 205748, 363666, 576406, 657666, 666651, 666666, 6657666, 6666651, 6666666, 18014806, 36394123, 66576666, 66666651, 66666666 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..34.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119103. See A119034 for a table of cross-references.

Sequence in context: A119367 A079801 A280259 * A180483 A102253 A246210

Adjacent sequences:  A119101 A119102 A119103 * A119105 A119106 A119107

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified March 27 04:08 EDT 2017. Contains 284144 sequences.