Problem 232. Project Euler: Problem 2, Sum of even Fibonacci

Created by Doug Hull

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Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

By considering the terms in the Fibonacci sequence whose values do not exceed the input value, find the sum of the even-valued terms.

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1875 Solutions
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Last Solution submitted on Nov 15, 2019

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Aurelien Queffurust on 20 Feb 2012

I wanted to use : z = feval(symengine,'numlib::fibonacci',10)
to get the 10th element for example but CODY returns:
Could not check out Symbolic Math Toolbox license.

pas de chance!

yurenchu on 13 Mar 2017

You should add test cases where x or x+1 equals an even fibonacci number (either small or large).

Majid Farzaneh on 15 Oct 2018

Nice problem. I always have problem with big numbers.

Mehdi BENSEDDIK on 10 Apr 2019

I solved the problem until x = 4000000 but x = 97455000 it gives me an error of exceeding the memory(overflow) because the number is too large.

Solution Comments

Solution 1586878

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Ankith Rathod on 19 Jul 2018

y is it not working when it even works on octave and get results in a sec

Solution 1586868

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1 Comment

Ankith Rathod on 19 Jul 2018

While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore.

those test numbers are too big

Solution 1287182

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Jitesh Kumar on 15 Oct 2017

it is correct but by server error its not showing

Solution 216651

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1 Comment

Harish Maradana on 13 Mar 2013

test for cheating

Solution 76573

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1 Comment

Peter Wittenberg on 14 Apr 2012

OK, I gamed this one so it only works up to about 1 billion. I wanted to see everyone else's interesting solutions.

Solution 26585

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2 Comments

Alfonso Nieto-Castanon on 3 Feb 2012

this trick (c.f. Solution 26456) works only for these particular test cases, it would fail for example with euler002(6)...

Ankith Rathod on 19 Jul 2018

While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore.

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Problem 232. Project Euler: Problem 2, Sum of even Fibonacci

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Problem 232. Project Euler: Problem 2, Sum of even Fibonacci

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Last 200 Solutions

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