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A023694
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Numbers with exactly 3 1's in ternary expansion.
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4
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13, 31, 37, 39, 41, 43, 49, 67, 85, 91, 93, 95, 97, 103, 109, 111, 113, 115, 117, 119, 123, 125, 127, 129, 131, 133, 139, 145, 147, 149, 151, 157, 175, 193, 199, 201, 203, 205, 211, 229, 247, 253, 255, 257, 259, 265, 271, 273, 275, 277, 279, 281, 285, 287, 289
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listen;
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OFFSET
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1,1
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LINKS
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MAPLE
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q:= n-> numboccur(1, convert(n, base, 3))=3:
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MATHEMATICA
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Select[ Range[ 270 ], (Count[ IntegerDigits[ #, 3 ], 1 ]==3)& ]
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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