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The American mathematician Lowell Schoenfeld (19202002) proved that if the Riemann hypothesis was true, then for all x greater than or equal to 2657. The smallest prime of form a^b+c^d, where the bases are prime and the exponents are composite digits, i.e., 2^8+7^4. Note that alternating the exponents we take the largest such prime, i.e., 2^4+7^8. [Loungrides]
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