242447domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the smallest prime such that it and the previous four primes are all of the form x^2 + n * y^2.at n=18A212605Primes of the form k + A037276(k) in more than one way.at n=36A340636Primes having only {2, 4, 7} as digits.at n=34A385784Prime numbersat n=21424