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A056693
Numbers n such that 70*R_n + 9 is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
3
1, 65, 85, 89, 101, 385, 623, 7783
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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