A119229 Numbers k such that the k-th triangular number contains only digits {5,8,9}.

10, 34, 109, 1054, 13114114, 105440870, 1340887434, 33454026929, 44472235965, 13106479203810, 3345411351684270, 131072391368959890, 421873345684598945

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119228. See A119034 for a table of cross-references.

Extensions

a(12)-a(13) from Tyler Busby, Mar 31 2023