The "random" numbers produced by computers aren't purely random. They are actually **pseudo-random**, meaning that they are produced by mathematical formulas that simulate randomness.

The **linear congruential generator** takes a *seed* \(X_0\) and generates subsequent pseudo-random numbers using the formula: \[X_{n + 1} = (aX_n + c) \mod m\]

\(X_1\) is the first pseudo-random number generated, \(X_2\) is the second, and so on.

Let **R** be the 2000th pseudo-random number generated by the linear congruential generator when \(X_0 = 42\), \(a = 25\), \(c = 31\), and \(m = 2^{20}\). What are the *last* three digits of **R**?

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