A119232 Triangular numbers composed of digits {6,7,9}.

6, 66, 666, 677766969666676, 66799696699976679697696799766996696

Offset

1,1

Comments

a(6) > 10^40. - Tyler Busby, Mar 29 2023

Links

Table of n, a(n) for n=1..5.

Giovanni Resta, Tridigital Triangular Numbers.

Formula

a(n) = A000217(A119233(n)). - Michel Marcus, Mar 27 2023

Crossrefs

Cf. A000217, A053973, A119233. See A119033 for a table of cross-references.

Sequence in context: A119210 A227220 A119234 * A186675 A186673 A213453

Adjacent sequences: A119229 A119230 A119231 * A119233 A119234 A119235

Keyword

nonn,base,more

Author

Giovanni Resta, May 10 2006

Extensions

a(5) from Max Alekseyev, Mar 10 2009

Status

approved