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A099414
Numbers n such that 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (
A002275
) of length n.
+0
1
0, 3, 5, 6, 48, 108, 245, 1044
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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