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Search: id:A163305
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| A163305 |
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Numerators of fractions in the approximation of the square root of 5 satisfying: a(n)= (a(n-1)+ c)/(a(n-1)+1); with c=5 and a(1)=0. Also product of the powers of two and five times the Fibonacci numbers. |
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1
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| 0, 5, 10, 40, 120, 400, 1280, 4160, 13440, 43520, 140800, 455680, 1474560, 4771840, 15441920, 49971200, 161710080, 523304960, 1693450240, 5480120320, 17734041600, 57388564480, 185713295360, 600980848640, 1944814878720
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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For denominators see: A084057 (= product of Lucas numbers (excluding first number (2)), and powers of 2)
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PROGRAM
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(PARI) a(n)=5*fibonacci(n-1)*2^(n-2) [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Aug 06 2009]
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CROSSREFS
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A000032, A000079, A084057, A000045
Sequence in context: A121158 A032772 A117865 this_sequence A001692 A038070 A136138
Adjacent sequences: A163302 A163303 A163304 this_sequence A163306 A163307 A163308
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KEYWORD
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nonn
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AUTHOR
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Mark Dols (markdols99(AT)yahoo.com), Jul 24 2009
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EXTENSIONS
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More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Aug 06 2009
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