A119083 Triangular numbers composed of digits {0,5,8}.

55, 5050, 500500, 50005000, 5000050000, 500000500000, 558080805855, 50000005000000, 808505508008850, 5000000050000000, 500000000500000000, 50000000005000000000, 5000000000050000000000, 5055055888880005805800, 500000000000500000000000

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119084. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119084(n)). - Tyler Busby, Mar 27 2023

Extensions

a(15) from Tyler Busby, Mar 27 2023