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Search: id:A089675
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| A089675 |
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Numbers n such that 9*R_n - 2 is a prime number, where R_n = 11...1 is the repunit (A002275) of length n. |
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16
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| 1, 2, 3, 17, 140, 990, 1887, 3530, 5996, 13820, 21873, 26045
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