The 2^n-th palindromic prime.

Terms

a(0) =2a(1) =3a(2) =7a(3) =151a(4) =757a(5) =14341a(6) =36563a(7) =1114111a(8) =1793971a(9) =7256527a(10) =115737511a(11) =188646881a(12) =746676647a(13) =11984748911a(14) =19541414591a(15) =75174747157