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A102983
Numbers n such that 4*10^n + R_n + 8 is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
2
2, 5, 77, 206, 1871, 3887
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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