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 A154611 #22 Sep 08 2022 08:45:40
%S A154611 1,3,5,6,7,9,11,12,13,15,16,17,18,19,20,21,23,24,25,26,27,29,30,31,33,
%T A154611 35,36,37,39,41,42,43,45,46,47,48,49,51,53,54,55,56,57,59,60,61,62,63,
%U A154611 64,65,66,67,69,70,71,72,73,75,76,77,78,79
%N A154611 Numbers n such that 7*n+3 is not prime.
%C A154611 The even terms are the integer values of (4*h*k + 2*k + 2*h - 2)/7, where h and k are positive integers. - _Vincenzo Librandi_, Jan 17 2013
%C A154611 The corresponding composite numbers are 10, 24, 38, 45, 52, 66, 80, 87, 94, 108, 115, 122, 129, ... - _Michael B. Porter_, Jan 17 2013
%H A154611 Vincenzo Librandi, <a href="/A154611/b154611.txt">Table of n, a(n) for n = 1..1000</a>
%t A154611 With[{nn=100},Sort[Join[Range[1,nn-1,2],Select[Range[0,nn,2], !PrimeQ[ 7#+3]&]]]] (* _Harvey P. Dale_, Aug 22 2012 *)
%t A154611 Select[Range[0, 100], !PrimeQ[7 # + 3]&] (* _Vincenzo Librandi_, Apr 05 2013 *)
%o A154611 (Magma) [n: n in [0..80] | not IsPrime(7*n+3)]; // _Vincenzo Librandi_, Apr 05 2013
%Y A154611 Cf. A089033, A045437, A017017.
%K A154611 nonn,easy
%O A154611 1,2
%A A154611 _Vincenzo Librandi_, Jan 15 2009
%E A154611 Erroneous comments deleted by _N. J. A. Sloane_, Jun 23 2010