Numbers k such that 197*2^k+1 is prime.

Terms

a(0) =15a(1) =19a(2) =35a(3) =55a(4) =59a(5) =115a(6) =163a(7) =371a(8) =1175a(9) =3047a(10) =5615a(11) =7855a(12) =9155a(13) =16467a(14) =22303a(15) =32879a(16) =66123a(17) =70619a(18) =85607a(19) =117047a(20) =238083a(21) =354335a(22) =1502095a(23) =1568755a(24) =1830255a(25) =2244347a(26) =3126343a(27) =3477399a(28) =4666979