a(n) = smallest k such that the digit sum of 7k is n.

Terms

a(0) =143a(1) =3a(2) =16a(3) =2a(4) =6a(5) =1a(6) =5a(7) =9a(8) =4a(9) =8a(10) =12a(11) =7a(12) =11a(13) =24a(14) =28a(15) =14a(16) =27a(17) =67a(18) =71a(19) =57a(20) =97a(21) =128a(22) =114a(23) =127a(24) =257a(25) =414a(26) =427a(27) =557a(28) =714a(29) =997