3524431

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=12A307711
• Primes p such that primepi(p)-1 divides p-1.at n=20A359044
• Prime numbersat n=251746