66711domain: NAppears in sequencesNumbers k such that phi(k) is equal to A008473(k+1).at n=12A039781a(n) = binomial(n,4) + binomial(n,2).at n=36A055795G.f. satisfies: A(x) = x + A( x*A(x)/(1 - x*A(x)) ).at n=13A210839