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This problem was topic at [URL="http://www.primepuzzles.net/problems/prob_050.htm"]www.primepuzzles.net[/URL] and a search has started for Cullen Primes but limited to prime exponents, see [URL="http://primepuzzles.redgolpe.com/topic.asp?TOPIC_ID=10"]primepuzzle forums[/URL]
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