55006domain: NAppears in sequencesNumbers k such that 2^k + 7 is prime.at n=39A057195Iccanobirt numbers (13 of 15): a(n) = R(R(a(n-1)) + a(n-2) + R(a(n-3))), where R is the digit reversal function A004086.at n=18A102123Number of chiral pairs of combinatorial maps with n edges.at n=7A170948