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Search: id:A138576
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| A138576 |
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Numbers n such that 2^(2*n-1)-1 is prime. |
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+0
1
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| 2, 3, 4, 7, 9, 10, 16, 31, 45, 54, 64, 261, 304, 640
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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2^(2*2-1)-1=7, 2^(2*3-1)-1=31, 2^(2*4-1)-1=127,...
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MATHEMATICA
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For[i=1, i<=1, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n-", i, "), ", a]; i=i+2]
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CROSSREFS
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Sequence in context: A057912 A141748 A057267 this_sequence A038197 A023546 A084913
Adjacent sequences: A138573 A138574 A138575 this_sequence A138577 A138578 A138579
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), May 13 2008
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