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A097685
Numbers n such that R_n + 8 is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
4
2, 5, 6, 8, 17, 50, 684, 720, 1452, 1679, 3146
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Maintained by
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
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