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 A205559 #9 Mar 30 2012 18:58:11 %S A205559 2,7,9,14,16,18,20,25,27,29,31,33,35,37,39,41,43,45,49,51,53,59,61,63, %T A205559 66,67,69,71,73,75,76,82,84,86,89,90,92,94,96,98,100,101,104,106,108, %U A205559 110,112,114,115,118,120,121,123,125,127,129,130,133,135,136 %N A205559 Positions of multiples of 3 in A204890 (differences of primes). %C A205559 For a guide to related sequences, see A205558. %e A205559 In A204890=(1,3,2,5,4,2,9,8,6,...), multiples of 3 are in positions 2,7,9,... ; see the example at A205560. %t A205559 (See the program at A205560.) %Y A205559 Cf. A205558, A205560. %K A205559 nonn %O A205559 1,1 %A A205559 _Clark Kimberling_, Jan 30 2012