405393domain: NAppears in sequencesNumber of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.at n=24A209346Numbers k such that {k^2 + 2, k^2 + 4} and {k^3 + 2, k^3 + 4} are twin prime pairs.at n=23A283698