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A119066 Numbers n such that the n-th triangular number contains only digits {0,3,7}. 2
2, 24, 37, 77, 775, 3943940, 7844837, 124153399, 393193023940, 78406253666877, 256907649052235, 1240997802874797 (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..12.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119065. See A119034 for a table of cross-references.

Sequence in context: A112660 A330526 A280648 * A019996 A119070 A181283

Adjacent sequences:  A119063 A119064 A119065 * A119067 A119068 A119069

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified September 28 04:37 EDT 2020. Contains 337392 sequences. (Running on oeis4.)