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A260047
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Composites whose prime factorization in base 3 is an anagram of the number in base 3.
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11
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16, 25, 160, 960, 1125, 1888, 3146, 3488, 3549, 4064, 4235, 4335, 4928, 5415, 5746, 5875, 7502, 7847, 8224, 8414, 8954, 9633, 10016, 10192, 11840, 12103, 12256, 12704, 12716, 12844, 16415, 16820, 16954, 18784, 18880, 19264, 19355, 19481, 22838
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history;
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internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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16 = 2^4. In base 3, 121 = 2^11.
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MATHEMATICA
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Select[Range[10^6], !PrimeQ[#] && Sort@ IntegerDigits[#, 3] == Sort@ Flatten@ IntegerDigits[ Select[ Flatten@ FactorInteger@ #, #>1 &], 3] &] (* Giovanni Resta, Jul 14 2015 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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