A119226 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A119226

Triangular numbers composed of digits {5,7,9}.

2

55, 595, 5995, 7779577597795, 9775779559755, 57575799959759975575, 77777755779995957575, 7577959575775997959995995979795

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(9) > 10^40. - Tyler Busby, Mar 29 2023

LINKS

Table of n, a(n) for n=1..8.

Giovanni Resta, Tridigital Triangular Numbers.

FORMULA

a(n) = A000217(A119227(n)). - Michel Marcus, Mar 27 2023

CROSSREFS

Cf. A000217, A119227. See A119033 for a table of cross-references.

Sequence in context: A119085 A119170 A119228 * A219928 A226543 A213341

Adjacent sequences: A119223 A119224 A119225 * A119227 A119228 A119229

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved