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 A345002 #7 Jun 05 2021 21:48:25 %S A345002 6,28,171,496,8128,478800,32317272,33550336 %N A345002 Numbers k such that A345001(k)/A342001(k) is a positive natural number and a divisor of k. %H A345002 <a href="/index/O#opnseqs">Index entries for sequences where odd perfect numbers must occur, if they exist at all</a> %o A345002 (PARI) %o A345002 A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1])); %o A345002 A003557(n) = (n/factorback(factorint(n)[, 1])); %o A345002 isA345002(n) = if(1==n,0,my(d=A003415(n), s=sigma(n)+d-(n+n), r=s/(d/A003557(n))); (r>0&&1==denominator(r)&&!(n%r))); %Y A345002 Cf. A000396 (subsequence), A003415, A003557, A342001, A345001. %Y A345002 Cf. also A344755. %K A345002 nonn,more %O A345002 1,1 %A A345002 _Antti Karttunen_, Jun 05 2021