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 A105642 #18 May 19 2019 14:53:31 %S A105642 6,10,12,14,15,18,20,21,22,24,26,28,30,32,33,34,35,38,39,40,42,44,45, %T A105642 46,48,50,51,52,54,55,56,57,58,60,62,63,65,66,68,69,70,72,74,75,76,77, %U A105642 78,80,82,84,85,86,87,88,90,91,92,93,94,95,96,98,99,102,104,105,106,108 %N A105642 Composite nonsquares and noncubes. %F A105642 a(n) = n + O(n/log n). - _Charles R Greathouse IV_, Oct 19 2015 %t A105642 nn=200; Complement[Range[nn], Prime[Range[PrimePi[nn]]], Range[Sqrt[nn]]^2, Range[nn^(1/3)]^3] (* _Harvey P. Dale_, Jan 26 2011 *) %o A105642 (PARI) is(n)=n>1 && !isprime(n) && !issquare(n) && !ispower(n,3) \\ _Charles R Greathouse IV_, Oct 19 2015 %Y A105642 Cf. A007774, A024619, A030231, A056760, A064040, A084227, A100658. %K A105642 nonn %O A105642 1,1 %A A105642 _Zak Seidov_, May 03 2005