1138829

Properties

Appears in sequences

• Lower primes p1 in a twin pair such that sum of p1 and p2 yields average a1 of twin prime pairs and product of 2*a1 is another average of twin prime pairs.at n=7A178421
• Sophie Germain primes that are also highly cototient numbers.at n=36A209194
• Primes which start a Cunningham chain of length 4 where every entity of the chain is smallest of twin prime.at n=1A236443
• a(n) is the least k for which omega(k)*omega(k + 1)*omega(k + 2) = n where omega = A001221, or -1 if no such k exists.at n=7A392184
• Prime numbersat n=88518