99441domain: NAppears in sequencesNumber of inequivalent ways (mod D_4) three checkers can be placed on an n X n board.at n=12A082966Numbers n such that n+2, n+4, n+6, n+8, n+10, n+12 and n+14 are all semiprimes.at n=7A268578Numbers k such that (68*10^k + 7)/3 is prime.at n=36A270613