85793domain: 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 25.at n=17A031613Primes p such that phi(p+1) = phi(phi(p-1)+1).at n=12A271655Prime numbersat n=8347