Index of 10^n within the sequence of the numbers of the form 3^i*10^j.

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =25a(5) =36a(6) =49a(7) =64a(8) =81a(9) =100a(10) =121a(11) =145a(12) =171a(13) =199a(14) =229a(15) =261a(16) =295a(17) =331a(18) =369a(19) =409a(20) =451a(21) =496a(22) =543a(23) =592a(24) =643a(25) =696a(26) =751a(27) =808a(28) =867a(29) =928