- lesser of twin primes (except 3) have a
*weight*of 3. - by definition primes classified by
*weight*(A162175) follow Legendre's conjecture and Andrica's conjecture.

- primes classified by
*level*(A162174) are rarefying among prime numbers.

2, 3 and 7 are not classfied.

**Zone 1**: primes for which *k(n) ≤ L(n)* or primes classified by *weight*. We have the following relation:

*g(n) + 1 ≤ k(n) ≤ sqrt(l(n)) ≤ L(n) ≤ l(n) / 3*

**Zone 2**: primes for which *k(n) > L(n)* or primes classified by *level*. We have the following relations:

*L(n) < sqrt(l(n)) < k(n) ≤ l(n)**L(n) + 2 ≤ g(n) + 1 ≤ k(n) ≤ l(n)*