83515

Appears in sequences

• Composite numbers k such that k!/k# + 1 is prime, where k# = primorial numbers A034386.at n=24A049420
• Number of different values assumed by a/b+c/d as a,b,c,d range between 1 and n.at n=29A119868
• Numbers k such that k!/k# + 1 is prime, where k# is the primorial function (A034386).at n=31A140294