Exponent of 5 (value of i) in n-th number of form 5^i*7^j.

Terms

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