2330161domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 4*a(n-1) + 2*n - 1.at n=11A141291a(n) = (5*2^n - 5*(-1)^n - 3*n*(-1)^n) / 9.at n=22A172285Prime numbersat n=171545