A119171 Numbers k such that the k-th triangular number contains only digits {2,5,9}.

10, 34, 109, 714, 765, 774, 227825, 14092049, 334531090, 33345441365, 1360847497350, 102951958915365, 3462935043926049509, 4455459562273973825

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119170. See A119034 for a table of cross-references.

Sequence in context: A019257 A288782 A020877 * A119229 A119227 A218631

Adjacent sequences: A119168 A119169 A119170 * A119172 A119173 A119174

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(13)-a(14) from Tyler Busby, Mar 31 2023

Status

approved