Odious numbers: numbers with an odd number of 1's in their binary expansion.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =8a(5) =11a(6) =13a(7) =14a(8) =16a(9) =19a(10) =21a(11) =22a(12) =25a(13) =26a(14) =28a(15) =31a(16) =32a(17) =35a(18) =37a(19) =38a(20) =41a(21) =42a(22) =44a(23) =47a(24) =49a(25) =50a(26) =52a(27) =55a(28) =56a(29) =59