perplexus.info :: Sequences : Fibo's common divider

Fibo's common divider (Posted on 2020-06-10)

1,1,2,3,5,8,13...

Given basic Fibonacci sequence (as above) with a₁=1 and a₂=1 evaluate the GCD of a₇₇₀ and a₁₀₀₀.

No Solution Yet Submitted by Ady TZIDON

Rating: 3.0000 (1 votes)

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closed form

Comment 4 of 4 |

The formula you want is:

GCD( a_m, a_n) = a_GCD(m,n)

so GCD(a_770, a_1000) = a_10 = 55.

Posted by FrankM on 2020-06-14 09:27:25

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