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A119149
Numbers k such that the k-th triangular number contains only digits {1,7,9}.
2
1, 13, 18, 58, 586, 1258, 58613, 1350538, 1414213, 59517693, 1398413386, 5996665693, 119976657489461
OFFSET
1,2
COMMENTS
Next term exceeds 1.4*10^16.
CROSSREFS
Cf. A000217, A119148. See A119034 for a table of cross-references.
Sequence in context: A318348 A197704 A218626 * A217658 A372763 A236999
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
STATUS
approved