A119228 Triangular numbers composed of digits {5,8,9}.

55, 595, 5995, 555985, 85989999559555, 5558888585898885, 898989555999995895, 559585958899855598985, 988889885885555858595, 85889898559958558998859955, 5595888555988988898588558558585, 8589985889588895598998885898885995, 88988559899558559855895555589855985

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

a(14) > 10^40. - Tyler Busby, Mar 26 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A058470, A119229. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119229(n)). - Tyler Busby, Mar 26 2023

Extensions

a(12)-a(13) from Tyler Busby, Mar 26 2023