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 A161889 #8 Mar 11 2014 01:32:33 %S A161889 2,5,7,13,16,23,25,31,35,39,41,49,51,55,59,65,67,71,73,79,83,87,89, %T A161889 103,106,109,113,121,123,127,129,135,137,141,143,151,153,157,161,167, %U A161889 169,173,175,181,187,191,193,203,205,209,211,217,219,223,226,229,233,237 %N A161889 a(1)=2. a(n) = the smallest integer > a(n-1) that is coprime to n, and is such that (a(n)-a(n-1)) is not a divisor of n. %C A161889 a(n) - a(n-1) = A161888(n). %Y A161889 Cf. A161888 %K A161889 nonn %O A161889 1,1 %A A161889 _Leroy Quet_, Jun 21 2009 %E A161889 More terms from _Sean A. Irvine_, Aug 05 2010