Problem: shows that 121 does not divide f (n) = n ^ 2 + 3n +5 for any natural number n. Background:
In this problem you need to activate more of your proficiencies already acquired. There are several key concepts that should start operating. In order of importance: Essential 
(to understand the statement): 1) divisibility 2) denial of a proposition
Needed (to try the demo) 3) demonstrations (logical argument)
Desirable:
4) congruences (for effectively manage issues of divisibility)
5) Vietta formulas (the "theoretical" remarkable products - for efficient factoring)
Tip Strategies
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