322849domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers 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 75.at n=9A031663Number of 3 X 3 X 3 magic cubes with sum 3n.at n=18A070302Prime numbersat n=27835