Primes of the form 3*k! + 1.A062551Primes of the form 3*k! + 1.Terms a(0) =7a(1) =19a(2) =73a(3) =2161a(4) =15121a(5) =1088641a(6) =10886401a(7) =18681062401External referencesoeis: A062551