62669domain: NAppears in sequencesWorst case of a Jacobi symbol algorithm.at n=7A005826Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 38.at n=7A031626G.f.: Product_{i>=1, j>=1} (1 + x^(i*j))^(i*j).at n=15A280541