Numbers k such that 247*2^k+1 is prime.

Terms

a(0) =6a(1) =14a(2) =18a(3) =26a(4) =34a(5) =42a(6) =56a(7) =74a(8) =78a(9) =94a(10) =132a(11) =146a(12) =186a(13) =284a(14) =302a(15) =1758a(16) =1816a(17) =2336a(18) =3374a(19) =3466a(20) =4522a(21) =8058a(22) =11114a(23) =12456a(24) =22172a(25) =26208a(26) =39794a(27) =61512a(28) =81576a(29) =238734