296377domain: 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 51.at n=13A031639Primes p such that q-p = 60, where q is the next prime after p.at n=20A126771Prime numbersat n=25721