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A093942
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Primes of the form 6*10^n + 7*R_n, where R_n is the repunit (A002275) of length n.
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0
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67, 677, 67777, 67777777777, 67777777777777, 67777777777777777777777777, 67777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777
(list; graph; refs; listen; history; internal format)
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