39035domain: NAppears in sequencesNumbers k such that j(k)*phi(k) = sigma(phi(k)), j(k) = A033831(k).at n=24A033856Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in the closed interval [0,n].at n=27A211057G.f. A(x) satisfies: 1 + x = Sum_{n>=0} x^n*(A(x)^n + 1)^n/(1 + x*A(x)^n)^(n+1).at n=11A324617