A119119 Triangular numbers composed of digits {1,3,8}.

1, 3, 88831, 1188111, 38311881, 11313313831, 83388881331381, 881388838113181838838811, 8138133831331381318318881, 183113183318838311383311313311, 133831381813113188111133181833111, 31188113313888818318833183383131131

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

No other terms below 10^41. - Tyler Busby, Mar 28 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053895, A119120. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119120(n)). - Tyler Busby, Mar 28 2023

Extensions

Two more terms from Max Alekseyev, May 12 2009