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A046413
Numbers n such that the repunit of length n (11...11, with n 1's) has exactly 2 prime factors.
+0
9
3, 4, 5, 7, 11, 17, 47, 59, 71, 139, 211, 251
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
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