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A119233 Numbers n such that the n-th triangular number contains only digits {6,7,9}. 2
3, 11, 36, 36817576, 365512507857054543 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Next entry must be greater than 4.4*10^17.

LINKS

Table of n, a(n) for n=1..5.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119232. See A119034 for a table of cross-references.

Sequence in context: A119161 A119211 A119235 * A178563 A069358 A108544

Adjacent sequences:  A119230 A119231 A119232 * A119234 A119235 A119236

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

365512507857054543 from Max Alekseyev, Mar 10 2009

STATUS

approved

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Last modified September 28 17:19 EDT 2020. Contains 337393 sequences. (Running on oeis4.)