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fib-sum

sum(fib(i)*fib(i+2017...

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fib-sum

sum(fib(i)*fib(i+2017...

Calculate

fib

(fib(i)*fib(i+2017),i...

Calculate

fib-ratsimp-sqrt

f(x,y):=x*y;

f(4,4);

fib(n):=1/sqrt(5)*(((...

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fib-sum

(sum(i*fib(i)^2,i,0,n...

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fib-fibtophi

f(x,y,z):=5*fib(x)*fi...

f(10,20,15);

fibtophi(x+y-z);

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fib

fib(11);

Calculate

fib

((fib(4020)-fib(4016)...

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fib

fib(n) +fib(n+1);

Calculate

fib

Run Example
(%i1)fib(n) ;
(%o1)                               fib(n)
(%i2) 
Run Example
fib(80);
(%o1)                          23416728348467685
(%i2) 
Run Example
fib(31);
(%o1)                               1346269
(%i2) 

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Help for Fib