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 A338449 #12 Aug 23 2024 15:05:26 %S A338449 1,2,2,6,3,3,5,10,10,2,7,14,14,6,15,30,10,2,11,22,22,6,21,42,14,6,3, %T A338449 33,55,110,10,26,13,39,6,6,2,17,34,34,38,19,57,15,30,70,42,21,51,85, %U A338449 170,10,46,23,69,6,66,22,77,35,105,15,6,26,78,39,3,5,65 %N A338449 a(n) is the radical of A338338(n). %H A338449 Rémy Sigrist, <a href="/A338449/b338449.txt">Table of n, a(n) for n = 1..10000</a> %H A338449 Rémy Sigrist, <a href="/A338449/a338449.gp.txt">PARI program for A338449</a> %F A338449 a(n) = A007947(A338338(n)). %e A338449 For n = 9: %e A338449 - A338338(9) = 20 = 2^2 * 5, %e A338449 - so a(9) = 2 * 5 = 10. %o A338449 (PARI) \\ See Links section. %Y A338449 Cf. A007947, A338338. %K A338449 nonn %O A338449 1,2 %A A338449 _Rémy Sigrist_, Oct 28 2020