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A119122
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Numbers k such that the k-th triangular number contains only digits {1,3,9}.
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2
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1, 2, 13, 621, 4458, 489884458, 632318261, 893464178, 16684802253, 1621069592578, 2502478528946, 250255842662341, 1543458022195053, 527851115257700546
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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