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A093404
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Primes of the form 70*R_n + 9, where R_n is the repunit (A002275) of length n.
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1
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79, 777777777777777777777777777777777777777777777777777777777777777779, 77777777777777777777777777777777777777777777777777777777777777777777777777777777777779, 777777777777777777777777777777777777777777777777777777777777777777777777777777777777777779
(list; graph; refs; listen; history; internal format)
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