Exactly 2 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a lucky number.

Terms

a(0) =17a(1) =45a(2) =55a(3) =57a(4) =63a(5) =69a(6) =75a(7) =81a(8) =87a(9) =99a(10) =101a(11) =105a(12) =109a(13) =117a(14) =129a(15) =131a(16) =133a(17) =135a(18) =147a(19) =153a(20) =161a(21) =167a(22) =169a(23) =171a(24) =177a(25) =181a(26) =187a(27) =189a(28) =197a(29) =201