Number Theory

Common Misconceptions (Number Theory)

Number Theory Common Misconceptions: Level 3 Challenges

         

Can an even number, divided by another even number, times another even number ever equal an odd number?

If "yes," then find three numbers that work.
If "no," then why not?

Note that the three even numbers can be different numbers.

Clara Blackstone by Clara Blackstone

For integral choices of xx and yy, LCM(x,y)≤xy.\text{LCM}(x, y) \leq xy.

Is the above statement true or false?

Clarification: The LCM\text{LCM} is the Lowest Common Multiple of two numbers.

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Zandra Vinegar by Zandra Vinegar

NN is a positive integer such that 10N10N leaves a remainder of 70 when divided by 100; that is, 10N≡70 mod 100.10N \equiv 70 \bmod{100}. What is the remainder when NN is divided by 100?

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Eli Ross by Eli Ross

True or False: Every odd number greater than 1 is the smallest member of a primitive Pythagorean triple.

Note: A primitive Pythagorean triple is a triple of positive integers (a,b,c)(a,b,c) such that a2+b2=c2a^2+b^2 = c^2 and gcd⁡(a,b,c)=1.\gcd(a,b,c) = 1.

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Rob Matuschek by Rob Matuschek

IrrationalIrrational=Irrational\large\text{Irrational}^{\text{Irrational}}= \text{Irrational}

Is the above equation always true for irrational numbers? Each irrational number can be different.

Eli Ross by Eli Ross
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