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A119151 Numbers n such that the n-th triangular number contains only digits {1,8,9}. 2
1, 13, 61, 133, 613, 1333, 1341, 1413, 1541, 4878, 13333, 61938, 133333, 141413, 616261, 619386, 631186, 1333333, 13333333, 133333333, 1333333333, 13333333333, 133333333333, 1279701683121, 1333333333333, 1959029769461 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119150. See A119034 for a table of cross-references.

Sequence in context: A142402 A140615 A086361 * A081589 A270449 A139880

Adjacent sequences:  A119148 A119149 A119150 * A119152 A119153 A119154

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified May 6 05:18 EDT 2021. Contains 343580 sequences. (Running on oeis4.)