300690391

Properties

Appears in sequences

• Smallest prime which is 1 more than a product of n distinct primes: a(n) is a prime and a(n) - 1 is a squarefree number with n prime factors.at n=9A073918
• Primes p at which phi(p-1)/(p-1) reaches a new minimum, where phi is Euler's totient function.at n=16A241196
• Numbers n such that phi(n)/phi(phi(n)) > phi(m)/phi(phi(m)) for all m < n.at n=12A289125
• Numbers k such that uphi(k)/uphi(uphi(k)) > uphi(m)/uphi(uphi(m)) for all m < k, where uphi is the unitary totient function (A047994).at n=9A289127
• Least k such that the ratio of the number of residues mod k coprime to k and the number of primitive roots mod k is greater than or equal to n for k such that at least one primitive root mod k exists. Equivalently, k such that floor(phi(k)/phi(phi(k)) is a record value for those k belonging to A033948.at n=5A377402
• Prime numbersat n=16287713