Lucky numbers that are concatenations of n with n + 9.

Terms

a(0) =211a(1) =615a(2) =1827a(3) =2635a(4) =3039a(5) =3847a(6) =4251a(7) =5463a(8) =6271a(9) =8089a(10) =8493a(11) =98107a(12) =126135a(13) =132141a(14) =158167a(15) =168177a(16) =212221a(17) =222231a(18) =240249a(19) =242251a(20) =258267a(21) =278287a(22) =288297a(23) =296305a(24) =306315a(25) =312321a(26) =314323a(27) =350359a(28) =368377a(29) =384393