Numbers k such that k concatenated with k+6 is a lucky number.

Terms

a(0) =5a(1) =11a(2) =17a(3) =21a(4) =33a(5) =45a(6) =51a(7) =57a(8) =59a(9) =63a(10) =87a(11) =89a(12) =93a(13) =107a(14) =117a(15) =129a(16) =137a(17) =153a(18) =179a(19) =183a(20) =191a(21) =197a(22) =207a(23) =219a(24) =225a(25) =227a(26) =245a(27) =255a(28) =263a(29) =269