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

Terms

a(0) =148a(1) =191a(2) =296a(3) =592a(4) =659a(5) =1103a(6) =1184a(7) =1211a(8) =1318a(9) =1348a(10) =2206a(11) =2293a(12) =2368a(13) =2422a(14) =2636a(15) =2696a(16) =3817a(17) =4207a(18) =4586a(19) =4844a(20) =5272a(21) =5392a(22) =7634a(23) =9172a(24) =9221a(25) =9688a(26) =10391a(27) =10451a(28) =10544a(29) =10784