260269domain: 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 78.at n=6A031666Primes p such that q-p = 48, where q is the next prime after p.at n=29A134123Prime numbersat n=22858