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A260048 Composites whose prime factorization in base 4 is an anagram of the number in base 4. 11

%I

%S 25,637,722,1135,1243,1519,1639,1734,1863,2167,4735,4855,4939,5311,

%T 5746,5886,5967,6381,6589,6713,7003,7339,7407,7774,8154,8503,8667,

%U 8703,9457,11123,11221,11711,15471,16735,17779,17965,18079,18283,18477,18589

%N Composites whose prime factorization in base 4 is an anagram of the number in base 4.

%H Giovanni Resta, <a href="/A260048/b260048.txt">Table of n, a(n) for n = 1..10000</a>

%e 25 = 5^2. In base 4, 121 = 11^2.

%t Select[Range[10^6], !PrimeQ[#] && Sort@ IntegerDigits[#, 4] == Sort@ Flatten@ IntegerDigits[ Select[ Flatten@ FactorInteger@ #, #>1 &], 4] &] (* _Giovanni Resta_, Jul 14 2015 *)

%Y Cf. A260046, A260047, A260049, A260050, A260051, A260052, A260053, A025283, A260054, A260055.

%K base,easy,nonn

%O 1,1

%A _Stephen Tucker_, Jul 14 2015

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Last modified April 18 10:21 EDT 2021. Contains 343087 sequences. (Running on oeis4.)