Numbers with exactly 3 ones in binary expansion.

Terms

a(0) =7a(1) =11a(2) =13a(3) =14a(4) =19a(5) =21a(6) =22a(7) =25a(8) =26a(9) =28a(10) =35a(11) =37a(12) =38a(13) =41a(14) =42a(15) =44a(16) =49a(17) =50a(18) =52a(19) =56a(20) =67a(21) =69a(22) =70a(23) =73a(24) =74a(25) =76a(26) =81a(27) =82a(28) =84a(29) =88