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A093177
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Primes of the form 90*R_n + 1, where R_n is the repunit (A002275) of length n.
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7
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991, 99991, 9999991, 999999999999999999999999999999991, 999999999999999999999999999999999999999999991, 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999991
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