Smallest natural number k such that periodic part of 1/k is n, or 0 if no such k exists.

Terms

a(0) =1a(1) =9a(2) =45a(3) =3a(4) =144a(5) =18a(6) =6a(7) =36a(8) =72a(9) =1a(10) =99a(11) =9a(12) =825a(13) =1584a(14) =12672a(15) =66a(16) =61875a(17) =193359375a(18) =55a(19) =405504a(20) =495a(21) =825a(22) =45a(23) =309375a(24) =4125a(25) =396a(26) =792a(27) =44a(28) =6336a(29) =7734375