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 A167906 #12 Jan 07 2024 22:09:40 %S A167906 1,2,3,4,14,17,18,19,20,21,22,35,36,37,42,44,45,46,47,48,49,63,64,65, %T A167906 66,67,86,89,90,91,92,93,94,107,108,109,110,111,112,123,132,134,135, %U A167906 136,137,146,148,161,162,168,170,171,179,180,185,186,187,189,191,192,193 %N A167906 Fixed points of permutations A121878, A167904, A167905. %C A167906 A121878(a(n))=a(n); A167904(a(n))=a(n); A167905(a(n))=a(n). %H A167906 Scott R. Shannon, <a href="/A167906/b167906.txt">Table of n, a(n) for n = 1..10000</a> %o A167906 (PARI) print1(1,", ");v=[1]; n=1; while(n<100, if(issquarefree(n+v[#v])&&!vecsearch(vecsort(v), n), v=concat(v, n);if(n==#v,print1(n,", ")); n=0); n++) \\ _Derek Orr_, Jun 09 2015 %K A167906 nonn %O A167906 1,2 %A A167906 _Reinhard Zumkeller_, Nov 15 2009