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 A175008 #2 Mar 30 2012 18:57:11 %S A175008 4,7,8,10,13,15,16,19,21,23,24,27,28,31,32,35,37,39,41,43,44,46,49,51, %T A175008 53,55,56,59,61,63,65,67,68,71,72,75,77,79,81,83,85,87,88,90,92,94,97, %U A175008 99,101,103,105,107,108,111,113,115,117,119,121,123,125,127,129,132,133 %N A175008 Positions of negative terms in A131389. %C A175008 Is a(n+1)-a(n) always 1,2 or 3? %e A175008 The first 20 terms of A131389 are %e A175008 0,1,2,-1,3,4,-2,-3,6,-4,5,7,-5,8,-6,-7,9,10,-8,11. %e A175008 Positions occupied by negatives are %e A175008 4,7,8,10,13,15,16,19. %Y A175008 Cf. A131389, A175007. %K A175008 nonn %O A175008 1,1 %A A175008 _Clark Kimberling_, Apr 03 2010