A119116 Numbers k such that the k-th triangular number contains only digits {1,3,6}.

1, 2, 3, 8, 11, 16, 36, 163, 816, 115166, 475633, 1151836, 5677378, 35585421, 35598136, 51596833, 258114833, 1152095166, 11060118546, 112366468411, 1797838514253, 11234888843541, 78909614580621, 1632858433307288

Offset

1,2

Links

Table of n, a(n) for n=1..24.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119115. See A119034 for a table of cross-references.

Sequence in context: A039000 A059671 A212771 * A138756 A291202 A091076

Adjacent sequences: A119113 A119114 A119115 * A119117 A119118 A119119

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved