767857domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that q=2*p^2-1, r=2*p*q-1 and 2*p*r-1 are also prime.at n=19A224991Primes p such that p + 10^i are prime for i from 1 to 5.at n=30A387703Prime numbersat n=61575