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A103064
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Numbers n such that 7*10^n + 6*R_n - 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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1, 7, 90, 93, 125, 147, 498, 868, 879, 1157, 2958, 3018, 3317, 3822, 6948, 8885, 13092
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