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 A221263 #15 Jul 16 2021 17:12:30 %S A221263 213556659624,359544809085,1329797339640,1548635130140,1746049287480, %T A221263 1810001934510,1867318744632,1875874796664,1909975290390, %U A221263 2040256862622,2516452216712,3407803953785,6329875033944,7792308679512,7840198408728,7877108796312,8098434291288,8241610823832 %N A221263 Numbers k such that sigma(k) is the fifth power of the sum of the prime divisors of k. %C A221263 The smallest k for which sigma(k) = sopf(k)^6 is 45770980141656. Other such values are 5245619666623908 and 5582294774581035. %H A221263 Robert Gerbicz, <a href="/A221263/b221263.txt">Table of n, a(n) for n = 1..10000</a> %e A221263 213556659624 = 2^3*3^3*7^3*11*31*79*107 and sigma(213556659624) = (2+3+7+11+31+79+107)^5. %Y A221263 Cf. A000203, A008472. %Y A221263 Cf. A187771 (sigma(k)=sopf(k)^3), A221262 (sigma(k)=sopf(k)^4). %K A221263 nonn %O A221263 1,1 %A A221263 _Giovanni Resta_, Jan 07 2013