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A119237 Numbers n such that the n-th triangular number contains only digits {7,8,9}. 2
12, 132, 1332, 13332, 133332, 1247307, 1333332, 3949427, 13333332, 133333332, 1333333332, 13333333332, 133333333332, 397189873707, 1333333333332, 13333333333332, 133333333333332, 1333333333333332, 13333333333333332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119236. See A119034 for a table of cross-references.

Sequence in context: A340508 A119217 A334334 * A038729 A125447 A162767

Adjacent sequences:  A119234 A119235 A119236 * A119238 A119239 A119240

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified May 15 13:20 EDT 2021. Contains 343920 sequences. (Running on oeis4.)