617467domain: NPropertiesPrimalityPrimeyesAppears in sequencesWhere prime race 4m-1 vs. 4m+1 is tied.at n=22A007351Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,5,2,0,1,1,2 for x=0,1,2,3,4,5,6.at n=6A203217Prime numbersat n=50431