Numbers k such that 427*2^k+1 is prime.

Terms

a(0) =2a(1) =4a(2) =6a(3) =8a(4) =12a(5) =20a(6) =22a(7) =56a(8) =66a(9) =94a(10) =136a(11) =142a(12) =174a(13) =186a(14) =200a(15) =286a(16) =352a(17) =362a(18) =512a(19) =582a(20) =842a(21) =1056a(22) =1080a(23) =1144a(24) =1242a(25) =1810a(26) =4802a(27) =5106a(28) =6914a(29) =12982