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

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

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..12.

Giovanni Resta, Tridigital Triangular Numbers.

Formula

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

Crossrefs

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

Sequence in context: A230719 A213000 A151594 * A164841 A171366 A292691

Adjacent sequences: A119116 A119117 A119118 * A119120 A119121 A119122

Keyword

nonn,base

Author

Giovanni Resta, May 10 2006

Extensions

Two more terms from Max Alekseyev, May 12 2009

Status

approved