221891domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers n such that ((1+I)^n+1)/(2+I) is a Gaussian prime.at n=30A124112Primes p such that (2^p - 2^((p+1)/2) + 1)/5 is prime.at n=16A125742Primes which have the same (base 10) digital sum A007953 as the next smaller and next larger prime.at n=10A217875Prime numbersat n=19768