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A061422
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Numbers k such that 2^(k-1) + k is prime.
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4
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OFFSET
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1,2
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COMMENTS
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 237, p. 66, Ellipses, Paris 2008.
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LINKS
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PROG
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CROSSREFS
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KEYWORD
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hard,nonn
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AUTHOR
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EXTENSIONS
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H. Zeisel found the probable prime 1885. - Benoit Cloitre, Jun 03 2002
New term 51381 from Nuutti Kuosa (see MathPages link). - Max Alekseyev, Feb 08 2009
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STATUS
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approved
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