264637domain: 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 48.at n=8A031636Primes of the form x^2+2^x+y^2+2^y, with x and y nonnegative.at n=20A162576Prime numbersat n=23199