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A102959
Numbers n such that 2*10^n + 7*R_n + 2 is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
2
1, 4, 34, 36, 42, 52, 163, 208, 216, 1417
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Maintained by
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njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
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