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 A102510 #7 Mar 30 2012 18:50:48 %S A102510 1,2,6,4,3,10,5,8,9,14,7,12,15,11,21,16,13,18,22,20,17,26,19,24,25,33, %T A102510 27,28,23,34,29,32,35,30,38,36,31,39,37,40,46,41,51,44,45,42,55,48,49, %U A102510 50,43,52,57,54,47,56,58,53,62,60,59,65,63,64,61,69,66,68,74,67,77,72 %N A102510 If n is squarefree then A090705(A100112(n)) else n. %C A102510 a(A005117(n)) = A090705(n) and a(A013929(n)) = A013929(n); %C A102510 A102511(n) = Sum(A008683(a(k)): k<=n) <= 1; %C A102510 permutation of the natural numbers with inverse A102513; %C A102510 A102512 = a(a(n)). %H A102510 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A102510 Cf. A005117, A008966. %K A102510 nonn %O A102510 1,2 %A A102510 _Reinhard Zumkeller_, Jan 13 2005