Primes of the form (2*n)!/(n!)^2+1.A075840Primes of the form (2*n)!/(n!)^2+1.Terms a(0) =2a(1) =3a(2) =7a(3) =71a(4) =3433a(5) =2704157a(6) =35345263801External referencesoeis: A075840