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A119211 Numbers n such that the n-th triangular number contains only digits {4,6,7}. 2
3, 11, 36, 976, 1236, 3048, 964131, 36536961224668, 123828734689848, 299247973315331 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Next entry must be greater than 1.4*10^16.

LINKS

Table of n, a(n) for n=1..10.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119210. See A119034 for a table of cross-references.

Sequence in context: A119090 A048361 A119161 * A119235 A119233 A178563

Adjacent sequences:  A119208 A119209 A119210 * A119212 A119213 A119214

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified September 24 11:06 EDT 2020. Contains 337317 sequences. (Running on oeis4.)