1299601

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=33A189536
• First of two consecutive (primes of the form n^2+1) with no semiprime of the same form between them.at n=15A242109
• Primes of the form (p + q)^2 + 1, where p and q are consecutive primes.at n=20A244095
• Primes that are the square of the sum of a twin prime pair plus 1.at n=10A261889
• 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=30A283658
• Prime numbersat n=99993