A119057 Triangular numbers composed of digits {0,2,9}.

990, 2090209222020090, 92209290022092090, 200290202090990220, 222020200990922029290

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(6) > 10^40. - Tyler Busby, Mar 28 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A058428, A119058. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119058(n)). - Michel Marcus, Mar 27 2023