Problem 44675. Find prime number couples

Created by Jafar Mortadha

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Given a vector a, which will always contain at least one pair of prime numbers couple, return a matrix called 'couple' in which each row contains one pair of prime couples. A prime number couple pair are two prime numbers with a difference of two between them. Keep in mind that the numbers 2, 3, 5, and 7 are prime numbers.

For example, if a=[1 2 3 6 11 13 101 103], the output should be couple=[11 13; 101 103].

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26 Solutions
13 Solvers

Last Solution submitted on Mar 07, 2020

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3 Comments

3 Comments

bainhome on 6 Jun 2018

Is there any particular reason why "1" should be a prime number? Since none of exampe in test suite pointing us to that direction. besides, I fail to figure out the necessity of that either.

James on 7 Jun 2018

Mathematically speaking, 1 is not a prime number. Primes are defined as number greater than 1. Also, the difference between 2 and 1 isn't two, so I don't see why [1 2] would be a valid output anyway.

Jafar Mortadha on 13 Jun 2018

James and bainhome, I apologise for making the two errors that you pointed out. I have corrected them and updated the problem.

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Problem Tags

algorithms mathematics poor_problem_statement prime numbers