Numbers k such that 321*2^k+1 is prime.

Terms

a(0) =1a(1) =5a(2) =32a(3) =68a(4) =109a(5) =128a(6) =133a(7) =212a(8) =241a(9) =653a(10) =776a(11) =1339a(12) =1787a(13) =2659a(14) =6388a(15) =6547a(16) =8365a(17) =16699a(18) =62861a(19) =64795a(20) =83227a(21) =195376a(22) =278875a(23) =442480a(24) =542876a(25) =730321a(26) =1168576a(27) =1257859a(28) =1629307a(29) =4715725