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A088553
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Primes of the form (3^x-1)/2 or (3^x+1)/2.
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3
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2, 5, 13, 41, 1093, 797161, 21523361, 926510094425921, 1716841910146256242328924544641, 3754733257489862401973357979128773, 6957596529882152968992225251835887181478451547013
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