1285632domain: NAppears in sequencesNumbers n such that uphi(uphi(n)) = n/2.at n=14A071008Numbers n such that n = k/d(k) has exactly 6 solutions, where d(k) = number of divisors of k.at n=6A217127Coefficients in expansion of E_6^2/E_4^3.at n=2A289210