194891domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4.at n=18A197497Emirps (A006567) whose difference with the reversal is a perfect square.at n=31A217386Prime numbersat n=17565