A119209 Numbers k such that the k-th triangular number contains only digits {4,5,9}.

9, 10, 34, 109, 314, 334, 1090, 3334, 33334, 141109, 333334, 436909, 3333334, 4369314, 31609965, 33166234, 33333334, 333333334, 3333333334, 3464100314, 33316662334, 33333333334, 104828011090, 301512701090, 333333333334

Offset

1,1

Links

Table of n, a(n) for n=1..25.

G. Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119208. See A119034 for a table of cross-references.

Sequence in context: A322653 A322465 A353600 * A329636 A289520 A038206

Adjacent sequences: A119206 A119207 A119208 * A119210 A119211 A119212

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Status

approved