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A028491
Numbers n such that (3^n - 1)/2 is prime.
(Formerly M2643)
+0
40
3, 7, 13, 71, 103, 541, 1091, 1367, 1627, 4177, 9011, 9551, 36913, 43063, 49681, 57917
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Maintained by
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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