A119055 Triangular numbers composed of digits {0,2,8}.

28, 820, 2080, 80200, 200028, 828828, 8002000, 800020000, 8028028828, 22002880200, 80000200000, 208808222028, 220028220028, 8000002000000, 800000020000000, 2880222880828800, 22822222802022028, 80000000200000000, 8000000002000000000, 80820888088020828828

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A119056. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119056(n)). - Tyler Busby, Mar 31 2023

Extensions

a(19)-a(20) from Tyler Busby, Mar 22 2023