Numbers k such that 251*2^k+1 is prime.

Terms

a(0) =1a(1) =11a(2) =13a(3) =17a(4) =35a(5) =77a(6) =155a(7) =325a(8) =4097a(9) =5471a(10) =7151a(11) =7561a(12) =9211a(13) =13535a(14) =14627a(15) =18361a(16) =21815a(17) =41945a(18) =68255a(19) =105947a(20) =119915a(21) =358777a(22) =748745a(23) =843367a(24) =1171193a(25) =2730917a(26) =3574535a(27) =3774587