Numbers k such that 19*2^k+1 is prime.

Terms

a(0) =6a(1) =10a(2) =46a(3) =366a(4) =1246a(5) =2038a(6) =4386a(7) =4438a(8) =6838a(9) =7498a(10) =7998a(11) =9450a(12) =11890a(13) =17034a(14) =23290a(15) =73338a(16) =149146a(17) =323638a(18) =853546a(19) =2206266a(20) =6833086