56375domain: NAppears in sequencesNumbers 41*k such that 41*k+2 and 41*k-6 are both prime.at n=19A153822a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = 0, a(2) = 0, a(3) = 1.at n=21A295858Partial sums of A299256.at n=33A299262