Numbers m with decimal expansion (d_k, ..., d_1) such that d_i = m * i mod 10 for i = 1..k.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =21a(11) =26a(12) =42a(13) =47a(14) =63a(15) =68a(16) =84a(17) =89a(18) =147a(19) =284a(20) =321a(21) =468a(22) =505a(23) =642a(24) =789a(25) =826a(26) =963a(27) =2468a(28) =2963a(29) =4321