1052813domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of tree-like octagonal systems.at n=9A036760Primes p such that q = 4p^2 + 1, r = 4q^2 + 1 and s = 4r^2 + 1 are all primes.at n=17A122429Prime numbersat n=82325