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Riesel number base 5
A Riesel number base 5 is a value of k such that k × 5n - 1 is always a composite number.
Using the same method presented in the Riesel problem article, it was found that 346,802 × 5n - 1 is multiple of 3, 7, 13, 31 or 601 (the covering set) depending on the value of n, so it is always composite.