91799domain: NAppears in sequencesSemiprimes p such that next semiprime after p is p+30.at n=2A217357Number of (7+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=16A252391