158625domain: NAppears in sequencesa(n) is the smallest m such that p = n-th popular prime = A385503(n) is uniquely popular on the interval [2,m] or -1 if p is never uniquely popular.at n=9A289662G.f.: (1 + 7*x) / (1 - 2*x - 9*x^2).at n=8A328604