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A119122
Numbers k such that the k-th triangular number contains only digits {1,3,9}.
2
1, 2, 13, 621, 4458, 489884458, 632318261, 893464178, 16684802253, 1621069592578, 2502478528946, 250255842662341, 1543458022195053, 527851115257700546
OFFSET
1,2
CROSSREFS
Cf. A000217, A119121. See A119034 for a table of cross-references.
Sequence in context: A013111 A179434 A101342 * A109947 A175513 A064185
KEYWORD
nonn,base,more
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(14) from Max Alekseyev, Oct 14 2012
STATUS
approved