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 A164383 #5 Oct 24 2017 17:56:54 %S A164383 6,9,15,21,27,33,35,45,51,57,63,65,75,77,87,93,105,111,117,135,141, %T A164383 143,153,155,161,171,177,183,185,195,201,203,215,231,237,243,245,255, %U A164383 261,267,273,275,285,287,297,315,321,335,341,351,357,363,371,377,387,393 %N A164383 Composite numbers of the form 4 + some prime. %e A164383 a(1)= 4+2(prime)=6 (composite). a(2)= 4+5(prime)=9 (composite). a(3)=4+11(prime) = 15 (composite). %t A164383 Select[4+Prime[Range[100]],CompositeQ] (* _Harvey P. Dale_, Oct 24 2017 *) %Y A164383 Cf. A000040, A002808, A107986, A046132. %K A164383 nonn %O A164383 1,1 %A A164383 _Juri-Stepan Gerasimov_, Aug 14 2009 %E A164383 Edited, entries checked, by _R. J. Mathar_, Aug 20 2009