185189domain: 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 50.at n=14A031638Primes that are concatenations of k with k + 4.at n=18A032627Primes of the form k^3 - 4.at n=11A201309Prime numbersat n=16765