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 A097247 #4 Mar 30 2012 18:50:44 %S A097247 1,2,3,3,5,6,7,6,5,10,11,5,13,14,15,5,17,10,19,15,21,22,23,10,7,26,15, %T A097247 21,29,30,31,10,33,34,35,15,37,38,39,30,41,42,43,33,7,46,47,15,11,14, %U A097247 51,39,53,30,55,42,57,58,59,25,61,62,35,15,65,66,67,51,69,70,71,30,73,74 %N A097247 A097246(A097246(n)). %C A097247 This sequence is not multiplicative, see example. %e A097247 m=20 and n=63 are coprime: %e A097247 a(20) = A097246(A097246(2*2*5)) = A097246(3*5)=15, %e A097247 a(63) = A097246(A097246(3*3*7)) = A097246(5*7)=35 and %e A097247 a(20*63) = A097246(A097246(2*2*3*3*5*7)) = A097246(3*5*5*7) = %e A097247 3*7*7 = 147 <> a(20)*a(63) = 15*35 = 525: the sequence is not multiplicative. %Y A097247 Cf. A097248. %K A097247 nonn %O A097247 1,2 %A A097247 _Reinhard Zumkeller_, Aug 03 2004