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 A205711 #10 Dec 01 2013 12:01:17
%S A205711 7,31,37,41,51,63,69,75,82,92,96,101,112,123,129,133,140,150,159,164,
%T A205711 178,187,198,202,214,224,228,232,236,241,246,260,269,273,280,290,294,
%U A205711 298,301,305,310,315,323,331,336,344,358,367,371,375,386,390
%N A205711 Positions of multiples of 9 in A204890 (differences of primes).
%C A205711 For a guide to related sequences, see A205558.
%e A205711 In A204890=(1,3,2,5,4,2,9,8,6,4,11,10,8,...), multiples of 9 are in positions 7,31,37,... See the example at A205712.
%t A205711 (See the program at A205712.)
%t A205711 With[{prs=Prime[Range[30]]},Flatten[Position[Flatten[Table[prs[[n]]- Take[ prs,n-1],{n,2,Length[prs]}]],_?(Divisible[#,9]&)]]] (* _Harvey P. Dale_, Dec 01 2013 *)
%Y A205711 Cf. A204890, A205712, A205558.
%K A205711 nonn
%O A205711 1,1
%A A205711 _Clark Kimberling_, Jan 31 2012