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 A049058 #9 Jul 18 2021 01:55:18 %S A049058 60,120,480,1464,7680,24504,490080 %N A049058 Second element s 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 A049058 Definition unclear, see comments in A049057. - _Sean A. Irvine_, Jul 17 2021 %e A049058 Factorizations 2^2*3*5, 2^3*3*5, 2^5*3*5, 2^3*3*61, 2^9*3*5, 2^3*3*1021, 2^5*3*5*1021 %Y A049058 Cf. A049057, A049059, A049060. %K A049058 nonn %O A049058 0,1 %A A049058 _Yasutoshi Kohmoto_