53294domain: NAppears in sequencesn*10^4-1, n*10^4-3, n*10^4-7 and n*10^4-9 are all prime.at n=12A064978Expansion of x*(1+x-7*x^3-3*x^4+x^5)/(1-2*x^2-9*x^3+3*x^5).at n=14A356695