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Search: id:A138600
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| A138600 |
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Numbers n such that 2^(2*n-33)-33 is prime. |
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+0
1
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| 17, 21, 31, 55, 85, 91, 121, 159, 175, 379, 555, 769
(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*21-33)-33=479, 2^(2*31-33)-33=536870879, 2^(2*55-33)-33=151115727451828646838239, ...
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MATHEMATICA
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q=33; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^3}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
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CROSSREFS
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Sequence in context: A166875 A128546 A060875 this_sequence A050845 A125613 A147052
Adjacent sequences: A138597 A138598 A138599 this_sequence A138601 A138602 A138603
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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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