Numbers k such that 457*2^k+1 is prime.

Terms

a(0) =8a(1) =28a(2) =34a(3) =70a(4) =90a(5) =158a(6) =280a(7) =320a(8) =448a(9) =1240a(10) =3700a(11) =6608a(12) =7508a(13) =23514a(14) =34144a(15) =74760a(16) =118920a(17) =131668a(18) =353700a(19) =863568a(20) =915684