50650domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 18.at n=25A031696a(n) = 625*n^2 + 25.at n=8A157915a(n) = n*(3*n^2 + 6*n + 1).at n=25A196507Numbers n of the form p^k - k = q^i - i for primes p < q.at n=7A268594