a(n) is the number of pairs of primes (p,q), p < q, such that (p + q)/2 = n!.

A350782

a(n) is the number of pairs of primes (p,q), p < q, such that (p + q)/2 = n!.

Terms

    a(0) =1a(1) =5a(2) =18a(3) =60a(4) =315a(5) =1615a(6) =9928a(7) =70437a(8) =637504a(9) =5829386a(10) =64647125a(11) =722750400

External references