Numbers k such that k surrounded by digit '3' is a lucky number.

Terms

a(0) =0a(1) =9a(2) =12a(3) =13a(4) =15a(5) =16a(6) =18a(7) =21a(8) =22a(9) =24a(10) =31a(11) =36a(12) =40a(13) =43a(14) =45a(15) =60a(16) =61a(17) =63a(18) =66a(19) =75a(20) =76a(21) =79a(22) =84a(23) =87a(24) =94a(25) =100a(26) =103a(27) =109a(28) =114a(29) =126