A119172 - OEIS

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

A119172

Triangular numbers composed of digits {2,6,7}.

2

6, 66, 276, 666, 7626, 6666726, 77666666626, 2662627722726, 2777672627676766, 77772662277672726, 6622726277766676626, 672667762262676277666726

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

OFFSET

1,1

COMMENTS

a(13) > 10^40. - Tyler Busby, Mar 29 2023

LINKS

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

Giovanni Resta, Tridigital Triangular Numbers.

FORMULA

a(n) = A000217(A119173(n)). - Tyler Busby, Mar 29 2023

CROSSREFS

Cf. A000217, A058462, A119173. See A119033 for a table of cross-references.

Sequence in context: A133424 A045641 A071276 * A064167 A175455 A185253

Adjacent sequences: A119169 A119170 A119171 * A119173 A119174 A119175

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved