Primes of the form (5*4^k + 1)/3.A352046Primes of the form (5*4^k + 1)/3.Terms a(0) =2a(1) =7a(2) =107a(3) =6827a(4) =27962027a(5) =1789569707a(6) =114532461227External referencesoeis: A352046