726313domain: NAppears in sequencesNumbers k such that phi(k)=p^2, where p is product of digits of k.at n=24A153427Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,4,2,0,2,0,2 for x=0,1,2,3,4,5,6.at n=6A205075