Numbers k such that 111*2^k+1 is prime.

Terms

a(0) =1a(1) =4a(2) =28a(3) =32a(4) =44a(5) =47a(6) =71a(7) =128a(8) =137a(9) =193a(10) =676a(11) =2344a(12) =7828a(13) =10883a(14) =21596a(15) =31724a(16) =47783a(17) =49816a(18) =61300a(19) =212396a(20) =415412a(21) =2382772a(22) =2841992a(23) =4091044