Numbers k such that 211*2^k+1 is prime.

Terms

a(0) =20a(1) =28a(2) =32a(3) =192a(4) =380a(5) =1408a(6) =1672a(7) =2736a(8) =6276a(9) =8140a(10) =31156a(11) =40036a(12) =166252a(13) =287388a(14) =449788a(15) =456840