186569domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 2m*691 - 1.at n=24A134671Number of (n+1) X 2 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.at n=22A186454Prime numbersat n=16881