3920401

Properties

Appears in sequences

• Primes p such that sigma(p-1)+sigma(p+1) is prime.at n=33A067464
• Primes of the form (n^2)*(n+1)^2 + 1.at n=14A179923
• Numbers d > 1 such that the class number of Q(sqrt(d)) is strictly greater than the class number of Q(sqrt(m)) for all m < d.at n=37A283658
• Prime numbersat n=277949