%I #9 Jul 18 2021 01:55:18
%S 60,120,480,1464,7680,24504,490080
%N 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 Definition unclear, see comments in A049057. - _Sean A. Irvine_, Jul 17 2021
%e 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 Cf. A049057, A049059, A049060.
%K nonn
%O 0,1
%A _Yasutoshi Kohmoto_