Numbers that contain at least one 7.

Terms

a(0) =7a(1) =17a(2) =27a(3) =37a(4) =47a(5) =57a(6) =67a(7) =70a(8) =71a(9) =72a(10) =73a(11) =74a(12) =75a(13) =76a(14) =77a(15) =78a(16) =79a(17) =87a(18) =97a(19) =107a(20) =117a(21) =127a(22) =137a(23) =147a(24) =157a(25) =167a(26) =170a(27) =171a(28) =172a(29) =173