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 A209195 #13 Jul 08 2019 12:28:40 %S A209195 2,3,5,3,13,5,7,73,5,241,433,13,577,7,1153,11,43,29,7,8641,41,11,7, %T A209195 30241,17,61,47,31,13,11,103681,73,161281,13,7,241921,19,41,293,11,17, %U A209195 1451521,31,2177281,83,2903041,11,4354561,109,5806081,13,8709121,9676801 %N A209195 Smallest prime factor of the n-th highly totient number (A097942(n)) plus 1. %H A209195 Amiram Eldar, <a href="/A209195/b209195.txt">Table of n, a(n) for n = 1..109</a> (calculated from the b-file at A097942) %F A209195 a(n) = A020639(A097942(n) + 1). - _Amiram Eldar_, Jul 08 2019 %Y A209195 Cf. A020639, A097942. %K A209195 nonn %O A209195 1,1 %A A209195 _N. J. A. Sloane_, Mar 05 2012 %E A209195 More terms from _Amiram Eldar_, Jul 08 2019