9123840domain: NAppears in sequencesLCM of totients of binomial coefficients C(n,j), j = 0..n.at n=23A064451a(n) = phi(binomial(2n, n)).at n=13A066973a(n) = A062401(2^n-1).at n=23A096853Numbers k such that there exist three numbers x, y and z such that k = psi(x) = psi(y) = psi(z) = x + y + z.at n=28A387290