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A119127
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Numbers k such that the k-th triangular number contains only digits {1,4,7}.
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2
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1, 18, 38, 58, 15306, 28893, 3851686, 595216169886, 53248694146381, 536869582203620058, 14927275335718688666
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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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