Exponents k for which reversal(2^k-1) is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =53a(4) =189a(5) =293a(6) =1107a(7) =2181a(8) =2695a(9) =2871a(10) =7667a(11) =19999a(12) =27471a(13) =44537a(14) =62323a(15) =134367a(16) =174295