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A119202
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Triangular numbers composed of digits {4,5,6}.
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2
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6, 45, 55, 66, 465, 666, 4465, 4656, 5565, 6555, 46665, 544446, 4465566, 5456556, 5656566, 64564566, 4565545455565, 4664644554466, 56466665456545, 555445466565465, 555445666545666, 555665666566566, 4446456564566646, 6666664664655666, 46566644555566656
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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Table[Select[FromDigits/@Tuples[{4, 5, 6}, n], OddQ[Sqrt[8#+1]]&], {n, 17}]//Flatten (* Harvey P. Dale, Aug 28 2023 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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