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A056660
Numbers n such that 20*R_n + 1 is a prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
2
3, 17, 99, 120, 243, 545, 630, 1493, 2565, 8087
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Maintained by
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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.
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