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Search: id:A081073
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| A081073 |
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Fibonacci(4n+2)+3, or Fibonacci(2n-1)*Lucas(2n+3). |
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+0
1
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| 4, 11, 58, 380, 2587, 17714, 121396, 832043, 5702890, 39088172, 267914299, 1836311906, 12586269028, 86267571275, 591286729882, 4052739537884, 27777890035291, 190392490709138, 1304969544928660, 8944394323791467
(list; graph; listen)
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OFFSET
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0,1
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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)
a(n)=3+(1/2)*{[(7/2)-(3/2)*sqrt(5)]^n+[(7/2)+(3/2)*sqrt(5)]^n}+(3/10)*sqrt(5)*{[(7/2)+(3/2) *sqrt(5)]^n-[(7/2)-(3/2)*sqrt(5)]^n}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Dec 01 2008]
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MAPLE
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with(combinat): for n from 0 to 40 do printf(`%d, `, fibonacci(4*n+2)+3) od:
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CROSSREFS
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Cf. A000045 (Fibonacci numbers).
Sequence in context: A027042 A051770 A032181 this_sequence A002831 A114053 A134823
Adjacent sequences: A081070 A081071 A081072 this_sequence A081074 A081075 A081076
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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 04, 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 05, 2003
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