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A056701
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Numbers n such that 2*10^n + 3*R_n is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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0, 1, 2, 3, 4, 10, 16, 22, 53, 91, 94, 106, 138, 210, 282, 522, 597, 1049, 2227, 6459, 10582
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