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p(n)=((1+sqrt(5))/2)^n*(1/sqrt(5))-((1-sqrt(5))/2)^n*(1/sqrt(5)) for n=5
p(n)=((1+sqrt(5))/2)^n*(1/sqrt(5))-((1-sqrt(5))/2)^n*(1/sqrt(5)) for n=5
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