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 A049059 #9 Jul 18 2021 01:54:26 %S A049059 52,156,780,1248,13260,19968,468480 %N A049059 Third element t of (-1)sigma sociable triple (r,s,t): s=(-1)sigma(r), t=(-1)sigma(s), r=(-1)sigma(t), where if x=Product p(i)^r(i), then (-1)sigma(x)=Product(-1+(Sum p(i)^s(i), s(i)=1 to r(i))). %C A049059 Definition unclear, see comments in A049057. - _Sean A. Irvine_, Jul 17 2021 %e A049059 Factorizations 2^2*13, 2^2*3*13, 2^2*3*5*13, 2^5*3*13, 2^2*3*5*13*17, 2^9*3*13, 2^9*3*5*61 %Y A049059 Cf. A049057, A049058, A049060. %K A049059 nonn %O A049059 0,1 %A A049059 _Yasutoshi Kohmoto_