47273domain: NAppears in sequencesn*10^3-1, n*10^3-3, n*10^3-7 and n*10^3-9 are all prime.at n=26A064977Numerator of Sum_{k=0..n} n^k/k!.at n=6A120266Positive integers k such that k*3^k - 2 is prime.at n=15A182373