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Search: id:A081006
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| A081006 |
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Fibonacci(4n)-1, or Fibonacci(2n+1)*Lucas(2n-1). |
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+0
1
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| 2, 20, 143, 986, 6764, 46367, 317810, 2178308, 14930351, 102334154, 701408732, 4807526975, 32951280098, 225851433716, 1548008755919, 10610209857722, 72723460248140, 498454011879263, 3416454622906706, 23416728348467684
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Hugh C. Williams, Edouard Lucas and Primality Testing, John Wiley and Sons, 1998, p. 75
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FORMULA
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a(n) = 8a(n-1)-8a(n-2)+a(n-3)
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MAPLE
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with(combinat) for n from 0 to 25 do printf(`%d, `, fibonacci(4*n)-1) od
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CROSSREFS
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Cf. A000045 (Fibonacci numbers), A000032 (Lucas numbers).
Sequence in context: A093647 A003490 A003481 this_sequence A000183 A081159 A105489
Adjacent sequences: A081003 A081004 A081005 this_sequence A081007 A081008 A081009
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KEYWORD
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nonn,easy
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AUTHOR
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R. K. Guy (rkg(AT)cpsc.ucalgary.ca), Mar 01, 2003
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EXTENSIONS
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More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Mar 03, 2003
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