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A119110 Numbers n such that the n-th triangular number contains only digits {1,2,9}. 2
1, 6, 13, 66, 666, 6666, 21406, 24133, 66666, 666666, 774586, 1498613, 6666666, 66666666, 205975386, 666666666, 6666666666, 66666666666, 619564221386, 666666666666, 6650249918806, 6666666666666, 7654017627258 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119109. See A119034 for a table of cross-references.

Sequence in context: A177127 A177175 A301605 * A041305 A215755 A144535

Adjacent sequences:  A119107 A119108 A119109 * A119111 A119112 A119113

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified October 16 17:49 EDT 2019. Contains 328102 sequences. (Running on oeis4.)