189961939

Properties

Appears in sequences

• a(n) is the least number k such that exactly fraction 1/n of the members of the reduced residue system mod k are prime, or 0 if there is no such k.at n=16A307711
• Primes p such that primepi(p)-1 divides p-1.at n=25A359044
• Primes prime(k) such that (prime(k) - k)^k == k (mod prime(k)).at n=9A381903
• Primes prime(k) such that k^k == k (mod prime(k)).at n=13A382520
• Prime numbersat n=10553442