Numbers k such that 53*2^k-1 is prime.

Terms

a(0) =2a(1) =6a(2) =8a(3) =42a(4) =50a(5) =62a(6) =362a(7) =488a(8) =642a(9) =846a(10) =2870a(11) =3042a(12) =5096a(13) =10556a(14) =12642a(15) =17850a(16) =21710a(17) =25230a(18) =30392a(19) =43122a(20) =206970a(21) =582078