Binary expansion contains 3 adjacent 0's.

Terms

a(0) =8a(1) =16a(2) =17a(3) =24a(4) =32a(5) =33a(6) =34a(7) =35a(8) =40a(9) =48a(10) =49a(11) =56a(12) =64a(13) =65a(14) =66a(15) =67a(16) =68a(17) =69a(18) =70a(19) =71a(20) =72a(21) =80a(22) =81a(23) =88a(24) =96a(25) =97a(26) =98a(27) =99a(28) =104a(29) =112