736367domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the concatenated form 7nn7.at n=4A102501Number of (3+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=25A252387Prime numbersat n=59261