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Use the same proof as Radó did in his paper: Assume there is a program $\Sigma$ that computes the value asked for, combine with a program that given $n$ computes $2 n$, and add $1$ to the result. Call the number of lines of the result $N$. Writing a program that computes $N$ should take at most $N$ lines (add $1$ $N$ times). Combine the above, the result is ...


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