Numbers k such that 397*2^k+1 is prime.

Terms

a(0) =4a(1) =6a(2) =16a(3) =24a(4) =30a(5) =36a(6) =40a(7) =52a(8) =60a(9) =78a(10) =132a(11) =204a(12) =352a(13) =556a(14) =1936a(15) =4876a(16) =5278a(17) =6450a(18) =6546a(19) =9498a(20) =10878a(21) =13012a(22) =22356a(23) =24498a(24) =28768a(25) =29952a(26) =41050a(27) =46242a(28) =56874a(29) =61414