2016401domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that sigma(p-1)+sigma(p+1) is prime.at n=27A067464Primes p of form n^2 + 1 such that p+2 and p+6 are also prime.at n=14A200992Primes of the form n^2 + 1 such that (n - 1)^2 + 1 and (n + 1)^2 + 1 are semiprimes.at n=6A234693Prime numbersat n=150087