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A119108 Numbers n such that the n-th triangular number contains only digits {1,2,8}. 2
1, 6, 7, 47, 66, 127, 487, 666, 1281, 1287, 1327, 1541, 1912, 6666, 7512, 13327, 60352, 66666, 133327, 666666, 1333327, 6666666, 13333327, 47375333, 66666666, 133333327, 666666666, 1333333327, 6666666666, 12750044793, 13333333327 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..31.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119107. See A119034 for a table of cross-references.

Sequence in context: A042091 A047181 A080879 * A248264 A042843 A182622

Adjacent sequences:  A119105 A119106 A119107 * A119109 A119110 A119111

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)