239201

Properties

Appears in sequences

• a(n) is the smallest prime factor of n^n+1 having the form k*n+1.at n=23A187022
• a(n) equals the smallest Sophie Germain prime q such that pi_(p,2p+1)(q,10,(1,3)) - pi_(p,2p+1)(q,10,(3,1)) = n, where pi_(p,2p+1)(q,10,(b,c)) equals the number of Sophie Germain primes A005384(i) such A005384(i) <= q and (A005384(i),A005384(i+1)) == (b,c) (mod 10).at n=21A333084
• Primes of the form (2*p^2 + 1)/3 where p is a prime > 3.at n=31A362225
• Prime numbersat n=21156