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 A084331 #7 Aug 23 2014 13:04:20 %S A084331 2,3,5,11,7,17,29,13,31,23,37,59,19,43,71,41,61,97,47,73,107,53,101, %T A084331 139,67,109,167,79,131,163,83,127,173,89,149,211,103,179,113,181,251, %U A084331 137,193,257,151,229,311,157,269,359,191,277,373,197,271,389,199,293 %N A084331 a(1) = 2; a(n+1) is the least prime p not already used such that |p-a(n)| is not equal to |a(k+1)-a(k)| for any k < n. %e A084331 13 (not 19) follows 29 as 29-13 = 16 has not occurred as the difference of successive terms, though 19 has also not occurred earlier but 29-19 = 10 = 17-7. %Y A084331 Cf. A081145, A084334, A101595. %K A084331 nonn,easy %O A084331 1,1 %A A084331 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 17 2003 %E A084331 Edited and extended by _David Wasserman_, Dec 14 2004