39147domain: NAppears in sequencesNumbers k such that k^2 contains every digit at least once.at n=10A054038Numbers n such that n^2 contains every decimal digit exactly once.at n=10A156977a(n) = 74*n^2 + 1.at n=23A158742Least number x such that x^n has n digits equal to k. Case k = 7.at n=23A285454