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A119131
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Numbers k such that the k-th triangular number contains only digits {1,4,9}.
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2
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1, 13, 313, 538, 13741, 43386, 48886, 991886, 141415133, 2880781113, 4721227413, 19567549258, 538423521386, 137473211871979931561
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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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