1058389domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that A001414(p-1) = A001414(p+1), where A001414 = sum of primes dividing n (with repetition).at n=21A086711Primes p such that sopfr(p-1) = sopfr(p+1) is also prime, where sopfr is A001414.at n=5A190680Prime numbersat n=82717