Exponent of 5 (value of i) in n-th number of form 5^i*9^j.

Terms

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