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A093943
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Primes of the form 8*10^n + 7*R_n, where R_n is the repunit (A002275) of length n.
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1
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877, 8777777777, 8777777777777777, 877777777777777777777777777777777, 877777777777777777777777777777777777777, 877777777777777777777777777777777777777777777777777777777777777777
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