9558541domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are congruent to 1 mod n, where n is the index of the prime.at n=13A048891a(n) is the earliest number m such that n*pi(m)=phi(m).at n=14A097651Primes p such that pi(p) divides p-1 and/or p+1, where pi(p) is the number of primes <= p.at n=28A162567Prime numbersat n=637236