318016domain: NAppears in sequencesNumbers k such that sigma(k) mod pi(k) = 1.at n=29A073723The fourth row of the ED1 array A167546.at n=35A167547Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,1,0,2 for x=0,1,2,3,4.at n=9A196899