Numbers n such that 89*2^n-1 is prime.

Terms

a(0) =4a(1) =8a(2) =12a(3) =24a(4) =48a(5) =52a(6) =64a(7) =84a(8) =96a(9) =1272a(10) =2028a(11) =3224a(12) =4952a(13) =6892a(14) =7372a(15) =16476a(16) =56968a(17) =68632a(18) =185868a(19) =208824a(20) =369628