Problem 44675. Find prime number couples

Created by Jafar Mortadha

Solve Later

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].

Solve

Solution Stats

54 Solutions
25 Solvers

Last Solution submitted on Jan 03, 2026

Last 200 Solutions

Problem Comments

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.

Solution Comments

Show comments

Problem Recent Solvers25

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!