A119165 Numbers k such that the k-th triangular number contains only digits {2,5,6}.

3, 10, 11, 36, 71, 105, 114, 230, 714, 2128, 3363, 10550, 32411, 73010, 2309210, 3648430, 10641950, 23045894, 33336636, 72479825, 111581563, 229156071, 36118284988, 730103037471, 22915594088989, 106039853513914

Offset

1,1

Links

Table of n, a(n) for n=1..26.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119164. See A119034 for a table of cross-references.

Sequence in context: A078306 A136815 A119223 * A119080 A119221 A119219

Adjacent sequences: A119162 A119163 A119164 * A119166 A119167 A119168

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved