Woodall (or Riesel) numbers: n*2^n - 1.

Terms

a(0) =1a(1) =7a(2) =23a(3) =63a(4) =159a(5) =383a(6) =895a(7) =2047a(8) =4607a(9) =10239a(10) =22527a(11) =49151a(12) =106495a(13) =229375a(14) =491519a(15) =1048575a(16) =2228223a(17) =4718591a(18) =9961471a(19) =20971519a(20) =44040191a(21) =92274687a(22) =192937983a(23) =402653183a(24) =838860799a(25) =1744830463a(26) =3623878655a(27) =7516192767a(28) =15569256447a(29) =32212254719