4326401

Properties

Appears in sequences

• The smallest prime p such that tau(p-1) + tau(p+1) = prime(n), or 0 if no such prime exists; where tau(k) is the number of divisors of k.at n=31A189536
• Primes p of form n^2 + 1 such that p+2 and p+6 are also prime.at n=15A200992
• Number of -2..2 arrays of n elements with first and second differences also in -2..2.at n=12A201082
• Prime numbers of the form (n*(n+1)/2)^2 + 1.at n=13A262182
• Primes p of the form k^2 + 1 such that p+2 and 2p+1 are also prime.at n=5A347934
• Prime numbersat n=304546