Yes U0=1 and Un=10 x Un-1 +1
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No.
The factors of 1111 are: 1, 11, 101, 1111.
1111 is a composite number because it has more than two factors as it is divisible by 1, 1111 and 11.
11.11 = 1111/100 and simplifies to: 11 11/100
30/110 and 3030/1111 are two equivalent ratios.