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A119125
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Triangular numbers composed of digits {1,4,6}.
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2
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1, 6, 66, 666, 6441, 41616, 146611, 464166, 1464616, 4114146, 14116641, 664611111, 1164441411, 16646464416, 41641661166, 66114661161, 144161141446, 161646441166, 1464464661166, 4464411144441, 44416146616416, 61116114144646, 466141616644641, 1116644466666141, 1161666441164166
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Table[Select[FromDigits/@Tuples[{1, 4, 6}, n], OddQ[Sqrt[8#+1]]&], {n, 16}]//Flatten (* Harvey P. Dale, Jun 20 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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