Problem 250. Project Euler: Problem 10, Sum of Primes

Created by Doug Hull

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The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17.

Find the sum of all the primes below the input, N.

Thank you Project Euler Problem 10

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Last solution submitted on Sep 15, 2019

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Kye Taylor on 17 Apr 2012

The test suite could match the problem statement more closely if it would test an input that was also prime. One would expect that if the input is 7, the output would be 2 + 3 + 5 since 7 is not "below" 7?

Lin on 5 Aug 2012

The code "sum(find((isprime(1:x))))" works well on my own computer,but in cody it keeps says "While evaluating the solution, the server encountered an error caused by long running MATLAB code. Edit the code if needed and then rescore." I don't know why, is the test x=2000000 too large!?

Doug Hull on 6 Aug 2012

@Lin,

I think it is timing out. Why are you making your own tests anyways?

Pritesh Shah on 2 Aug 2014

I think, in last test, x=11; answer must be 17. less then given number....

Pritesh Shah on 2 Aug 2014

Use primes :: server encountered an error

David Verrelli on 15 Dec 2017

Pritesh Shah, you are correct. Well done for spotting this when many others didn't! It could be classified as a problem with the Test Suite, but given that this is tagged as "basic matlab" it may be more fitting to amend the problem statement.

Problem 250. Project Euler: Problem 10, Sum of Primes

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Problem 250. Project Euler: Problem 10, Sum of Primes

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