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A056706
Numbers n such that 4*10^n + 1*R_n is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
1
1, 3, 13, 25, 72, 108, 375, 393, 589, 973
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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