185153domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the least prime p, such that next_prime(2*p) - 2*p = 2*n - 1.at n=33A059846Primes of the form (n^2+2)/6 where n^2+1 is prime.at n=20A215429Prime numbersat n=16760