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 A081001 #4 Mar 30 2012 17:27:18 %S A081001 5,7,9,11,13,17,19,22,23,25,26,29,31,33,34,35,37,38,39,41,43,46,47,49, %T A081001 51,53,55,57,58,59,61,62,65,67,69,71,73,74,77,79,81,82,83,85,86,87,89, %U A081001 91,92,93,94,95,97,101,103,106,107,109,111,113,115,116,118,119 %N A081001 n is in the sequence if and only if it does not rank among the top n positive integers in centrality (cf. A080997 for fuller explanation of this concept). %C A081001 Complement of A081000. %F A081001 Formula for the centrality of n: A018804(n)/n^2 (see also A080997). %Y A081001 Cf. A080997, A080998, also A081028 for centrality ranks of primes (all of which are members of this sequence except 2 and 3). %K A081001 nonn %O A081001 1,1 %A A081001 _Matthew Vandermast_, Mar 02 2003