Exponent of 10 (value of j) in n-th number of form 6^i*10^j.

Terms

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