Problems & Puzzles: Problems Problem 10.- Find a 500-digit prime p and positive integers x, y Find a 500-digit prime p and positive integers x, y such that (p-1)/2 is prime, p divides 4^x - 9, and p divides 4^y - 25". Bernstein says "I'll pay $100 for the first published example of p, x, y". Problem posed by D. J. Bernstein (30/06/98), pointed out to me by mail by Samuli Larvala at 18/08/98.
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