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 A169750 #7 Apr 09 2014 23:45:11 %S A169750 1,3,6,2,7,5,11,4,12,9,18,8,19,14,26,13,27,20,35,24,40,23,10,28,47,30, %T A169750 50,29,51,32,55,31,56,33,59,86,58,87,57,88,120,91,60,93,127,92,128, %U A169750 165,203,164,124,83,41,84,128,173,136,90,43,91,42,92,143,102,154,101,155 %N A169750 A variation on Recamán's sequence A005132: see Comments for definition. %C A169750 Similar to A169748, but now B = 2,3,5,7,... (the primes). %K A169750 nonn %O A169750 1,2 %A A169750 _Rodolfo Kurchan_, Apr 08 2010 %E A169750 Corrected and extended by _D. S. McNeil_, May 09 2010