Random generator that remembers the numbers already generated
<p>Ok.</p>

<p>I need some code written that can make a 7 digit numeric value and store it so it does not come up again. As well have is outputted so I can see the number.
I also need some code in the program that will generate a string with numeric and letter values in it, which it also keeps track of and cannot generate again. I would need this second section to generate the string only between the amount of characters of 8-16. Thanks in advance. I don't care how difficult it may be.</p>
