a(n) is the smallest positive k such that k concatenated with k + n is a lucky number.

Terms

a(0) =3a(1) =6a(2) =1a(3) =2a(4) =1a(5) =4a(6) =5a(7) =6a(8) =59a(9) =2a(10) =1a(11) =4a(12) =5a(13) =6a(14) =1a(15) =6a(16) =3a(17) =2a(18) =3a(19) =10a(20) =7a(21) =2a(22) =7a(23) =4a(24) =3a(25) =4a(26) =1a(27) =14a(28) =1a(29) =2