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A068714
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Primes formed from a concatenation of 2 and 3^k for some k.
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2
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23, 29, 227, 281, 2243, 2729, 26561, 219683, 24782969, 210460353203, 2282429536481, 27625597484987, 250031545098999707, 279766443076872509863361, 2239299329230617529590083
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