31828domain: NAppears in sequencesNumbers n such that n | sigma_12(n).at n=29A055716Composite n such that (n-1)*phi(n) is a perfect square.at n=27A069953Numbers k such that the digits of k^2 are exactly the same (albeit in different order) as the digits of (k+1)^2.at n=10A072841Partial sums of A299283.at n=26A299284