A119089 Triangular numbers composed of digits {0,6,8}.

6, 66, 666, 66066, 600060, 808080868686, 6800080088880, 600060808600606, 6866666600888008866, 8868600066880068688680, 66888008886880660860006, 8068888000086860008866800600800680, 888806860800600880800086860880800680, 8006680886068066868608660888886880660

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base

Comments

a(15) > 10^40. - Tyler Busby, Mar 15 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers

Crossrefs

Cf. A000217, A119090. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119090(n)). - Michel Marcus, Mar 16 2023

Extensions

a(12)-a(14) from Tyler Busby, Mar 15 2023