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1. It satisfy constant C you choose;
2. Suppose it satisfy any integer n when X < n;
3. When X = n + 1, if n is odd, it satisfy n + 1;
if n is even, n + 1 is odd, [3 (n + 1) + 1] / 2 = 3 n / 2 + 2 is even,
then [3 n / 2 + 2] / 2 < n. The condition is satisfied.
4. If 3 n / 2 + 2 is not even, this can also be proved to satisfy, I have already proved it.
Now, you have a try, good luck!
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