304709domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^2 + 5.at n=28A056905Primes p such that for all 2^k < p the numbers p + 2^k, p - 2^k, p*2^k + 1, and p*2^k - 1 are composite.at n=17A256237Prime numbersat n=26381