Binary expansion contains 101.

Terms

a(0) =5a(1) =10a(2) =11a(3) =13a(4) =20a(5) =21a(6) =22a(7) =23a(8) =26a(9) =27a(10) =29a(11) =37a(12) =40a(13) =41a(14) =42a(15) =43a(16) =44a(17) =45a(18) =46a(19) =47a(20) =52a(21) =53a(22) =54a(23) =55a(24) =58a(25) =59a(26) =61a(27) =69a(28) =74a(29) =75