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A102970
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Numbers n such that 3*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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2, 3, 6, 12, 36, 39, 44, 90, 258, 512, 1482, 2378, 2406, 3224, 3378, 3876, 4161, 5510, 7425
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