This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A260047 #18 Jul 24 2015 03:50:34 %S A260047 16,25,160,960,1125,1888,3146,3488,3549,4064,4235,4335,4928,5415,5746, %T A260047 5875,7502,7847,8224,8414,8954,9633,10016,10192,11840,12103,12256, %U A260047 12704,12716,12844,16415,16820,16954,18784,18880,19264,19355,19481,22838 %N A260047 Composites whose prime factorization in base 3 is an anagram of the number in base 3. %H A260047 Giovanni Resta, <a href="/A260047/b260047.txt">Table of n, a(n) for n = 1..10000</a> %e A260047 16 = 2^4. In base 3, 121 = 2^11. %t A260047 Select[Range[10^6], !PrimeQ[#] && Sort@ IntegerDigits[#, 3] == Sort@ Flatten@ IntegerDigits[ Select[ Flatten@ FactorInteger@ #, #>1 &], 3] &] (* _Giovanni Resta_, Jul 14 2015 *) %Y A260047 Cf. A260046, A260048, A260049, A260050, A260051, A260052, A260053, A025283, A260054, A260055. %K A260047 base,easy,nonn %O A260047 1,1 %A A260047 _Stephen Tucker_, Jul 14 2015