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A218402
Numbers k such that the k-th triangular number contains only digits {0,7,9}.
2
44, 426096444, 12641976109035254775
OFFSET
1,1
COMMENTS
No other terms below 1.4*10^20.
CROSSREFS
Cf. A000217, A218401. See A119034 for a table of cross-references.
Sequence in context: A001782 A172910 A119058 * A131994 A037940 A037218
KEYWORD
base,nonn,more,hard,bref
AUTHOR
Max Alekseyev, Oct 28 2012
STATUS
approved