the prime factors of 13195 are 3，7，13 and 29.
what is the largest prime factor of the number 600851475143?
採用迴圈來遍歷求最大質數因子。設定乙個迴圈從2到比自身小1，逐次相除迭代（計算機最擅長的事就是做迴圈了），若除完之後的數只能被自身及一整除，那麼該數就是最大質數因子。
t = 600851475143;
for i = 2:t-1
if mod(t,i) == 0 %i是t的質數因子
t = t / i; %%如果t只能被自身及一整除
if t == 1
a = i; %i就是t的最大質數因子
break
endend
enda
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