119121domain: NAppears in sequencesResidues of the Lucas - Lehmer primality test for M(17) = 131071.at n=5A129222Number of (n+2) X (7+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 3 5 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 3 5 6 or 7.at n=26A252253