A119234 Triangular numbers composed of digits {6,8,9}.

6, 66, 666, 68898988866, 88698868996686886, 696999969866686966889999889666

Offset: 1

Author

Giovanni Resta, May 10 2006

Keywords

• nonn
• base
• more

Comments

a(7) > 10^37. - Max Alekseyev, Apr 30 2010

a(7) > 10^40. - Tyler Busby, Mar 29 2023

Links

• Giovanni Resta, Tridigital Triangular Numbers.

Crossrefs

Cf. A000217, A053975, A119235. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A119235(n)). - Michel Marcus, Mar 27 2023