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 A243489 #6 Jun 08 2014 08:59:07 %S A243489 6,7,11,12,14,15,17,18,19,21,25,26,28,29,31,32,33,35,37,38,39,40,41, %T A243489 42,43,44,45,46,47,48,49,50,51,52,53,57,58,59,60,61,62,63,67,68,70,71, %U A243489 73,74,75,77,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,99,100 %N A243489 Complement of A243490: Numbers n such that A069787(n) <> n. %C A243489 Numbers that are not fixed by permutation A069787. %H A243489 Antti Karttunen, <a href="/A243489/b243489.txt">Table of n, a(n) for n = 1..6644</a> %o A243489 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A243489 (define A243489 (MATCHING-POS 1 0 (lambda (k) (not (= k (A069787 k)))))) %Y A243489 Complement: A243490. Cf. A069787. %K A243489 nonn %O A243489 1,1 %A A243489 _Antti Karttunen_, Jun 07 2014