No.
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11111 looks like a prime but it;s not. 41 * 271 = 11111. 11111 is a composite number.
21% of 11,111 = 21% * 11111 = 0.21 * 11111 = 2,333.31
The factors of 11111 are 1, 41, 271, 11111, which makes it composite.
Yes U0=1 and Un=10 x Un-1 +1
11111/100000