Numbers k such that k*2^m+1 are composites for all exponents m in the range 0<=m<=k.

Terms

a(0) =47a(1) =94a(2) =188a(3) =257a(4) =376a(5) =383a(6) =766a(7) =881a(8) =1532a(9) =2897a(10) =3061a(11) =3064a(12) =4847a(13) =5297a(14) =5359a(15) =5794a(16) =5897a(17) =6122a(18) =6128a(19) =7013a(20) =7651a(21) =8423a(22) =9694a(23) =10223a(24) =10594a(25) =10718a(26) =11794a(27) =12244a(28) =13787a(29) =14026