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A119146 Triangular numbers composed of digits {1,7,8}. 2
1, 78, 171, 1711, 8778, 11781, 887778, 1188111, 18111171, 71778171, 88877778, 811178781, 7781717881, 8888777778, 181877771881, 887788118778, 888887777778, 88877878118778, 88888877777778, 181887881178871 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A053913, A119147. See A119033 for a table of cross-references.

Sequence in context: A044329 A044710 A046428 * A044410 A044791 A232386

Adjacent sequences:  A119143 A119144 A119145 * A119147 A119148 A119149

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified August 10 16:24 EDT 2022. Contains 356039 sequences. (Running on oeis4.)