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A119098 Numbers n such that the n-th triangular number contains only digits {1,2,3}. 2
1, 2, 6, 21, 66, 81, 206, 253, 666, 681, 4718, 6666, 6681, 66666, 66681, 156341, 666666, 666681, 1497406, 1569281, 6666666, 6666681, 66666666, 66666681, 666666666, 666666681, 6528600666, 6666666666, 6666666681, 66666666666 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..30.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119097. See A119034 for a table of cross-references.

Sequence in context: A228394 A245749 A001434 * A294706 A294707 A116842

Adjacent sequences:  A119095 A119096 A119097 * A119099 A119100 A119101

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)