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 A093354 #10 Jan 03 2015 16:36:09 %S A093354 0,0,0,0,0,0,1,1,1,1,2,2,2,2,2,2,3,3,5,5,5,5,7,7,7,7,7,7,9,9,11,11,11, %T A093354 11,11,11,11,11,11,11,13,13,16,16,16,16,17,17,17,17,17,17,20,20,20,20, %U A093354 20,20,23,23,24,24,24,24,24,24,26,26,26,26,30,30,32,32,32,32,32,32,36 %N A093354 Number of prime triples (p,q,r) with p < q < r <= n and q - p = r - q. %e A093354 a(20)=5: %e A093354 (3,5,7), 5 - 3 = 7 - 5; %e A093354 (3,7,11), 7 - 3 = 11 - 7; %e A093354 (5,11,17), 11 - 5 = 17 - 11; %e A093354 (3,11,19), 11 - 3 = 19 - 11; %e A093354 (7,13,19), 13 - 7 = 19 - 13. %K A093354 nonn %O A093354 1,11 %A A093354 _Reinhard Zumkeller_, Apr 27 2004