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Search: id:A117808
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| A117808 |
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a(n) = Floor[((2 + Sqrt[3])^n + (2 - Sqrt[3])^n)/4] |
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+0
1
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| 3, 13, 181, 2521, 489061, 6811741, 1321442641, 18405321661, 3570537526921, 9647591076297901
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Gaukman sequence from Mathworld Mathematica notebook.
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REFERENCES
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Eric Weisstein. "Prime-Generating Polynomial." http://mathworld.wolfram.com/Prime-GeneratingPolynomial.html
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MATHEMATICA
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a=Expand[Table[(((2 + Sqrt[3])^#1 + (2 - Sqrt[3])^#1)/4 & )[Prime[n]], {n, 10}]] Floor[a]
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CROSSREFS
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Sequence in context: A140421 A114317 A081299 this_sequence A002065 A087601 A112093
Adjacent sequences: A117805 A117806 A117807 this_sequence A117809 A117810 A117811
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KEYWORD
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nonn,uned
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Apr 29 2006
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