72247domain: NAppears in sequencesSmallest number k such that M(n)^2-k*M(n)-1 is prime with M(n) = Mersenne primes = A000668(n).at n=24A139424Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.at n=14A146869