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 A079881 #4 Mar 30 2012 18:50:30 %S A079881 1,2,3,4,5,4,7,8,9,4,11,8,13,4,9,16,17,27,19,8,9,4,23,16,25,4,27,8,29, %T A079881 27,31,32,9,4,25,16,37,4,9,16,41,27,43,8,27,4,47,32,49,125,9,8,53,81, %U A079881 25,16,9,4,59,16,61,4,27,64,25,27,67,8,9,125,71,32,73,4,125,8,49,27,79,32 %N A079881 mpf(n)^Omega(n), where mpf(n) is the median prime factor of n (A079879). %C A079881 A068794(n)<=a(n)<=A068795(n); %C A079881 a(m)=m=A068794(m)=A068795(m) iff m is a prime power (A000961). %Y A079881 a(n)=A079879(n)^A001222(n), A033676, O000004. %K A079881 nonn %O A079881 1,2 %A A079881 _Reinhard Zumkeller_, Jan 13 2003