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A119209 Numbers n such that the n-th triangular number contains only digits {4,5,9}. 2
9, 10, 34, 109, 314, 334, 1090, 3334, 33334, 141109, 333334, 436909, 3333334, 4369314, 31609965, 33166234, 33333334, 333333334, 3333333334, 3464100314, 33316662334, 33333333334, 104828011090, 301512701090, 333333333334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119208. See A119034 for a table of cross-references.

Sequence in context: A007252 A322653 A322465 * A289520 A038206 A154389

Adjacent sequences:  A119206 A119207 A119208 * A119210 A119211 A119212

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified February 22 05:17 EST 2019. Contains 320385 sequences. (Running on oeis4.)