Question

MATLAB

Write a function called next_prime that takes a scalar positive integer input n. Use a while-loop to find and return k, the smallest prime number that is greater than n. Feel free to use the built-in isprime function (do not use nextprime). MATLAB

Answer 1

function k = next_prime(n)

while n > 1

   n = n + 1;

   if isprime(n)

       k = n;

       break

   end   

end

Answer 2

function k = next_prime(n)
    k = n+1;
    while ~isprime(k)
        k = k+1;
    end
end

% testing above function
next_prime(10)
next_prime(15)