A119077 Triangular numbers composed of digits {0,4,9}.

990, 4009490400090, 990440044904409490, 9900404040400404004090

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(5) > 10^40. - Tyler Busby, Mar 28 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A058444, A119078. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119078(n)). - Tyler Busby, Mar 28 2023