A119227 - OEIS

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A119227

Numbers k such that the k-th triangular number contains only digits {5,7,9}.

2

10, 34, 109, 3944509, 4421714, 10730871349, 12472189525, 3893060383753634

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OFFSET

1,1

COMMENTS

Next term exceeds 1.4*10^16.

LINKS

Table of n, a(n) for n=1..8.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119226. See A119034 for a table of cross-references.

Sequence in context: A020877 A119171 A119229 * A218631 A166066 A232583

Adjacent sequences: A119224 A119225 A119226 * A119228 A119229 A119230

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved