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Re^2: Explain Fibonacci one-liner ??

by JavaFan (Canon)
on May 10, 2010 at 18:27 UTC ( [id://839275]=note: print w/replies, xml ) Need Help??

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  1. or download this
      F(n) = floor((((1+sqrt(5))/2)**n) / sqrt(5)) + 0.5)
    
  2. or download this
    my $PHI = (1 + sqrt(5)) / 2;
    sub fib ($) {int($PHI ** $_[0] / sqrt(5) + 0.5)}
    ...
    21
    34
    55
    

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