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Thomas Andrews

Cambridge, MA

thomasoandrews.com

Age: 47

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42
How did Euler prove the Mersenne number $2^{31}-1$ is a prime so early in history?
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42
Why do we negate the imaginary part when conjugating?
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38
Is McGee's counterexample to Modus Ponens accepted by the mathematical community?
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36
Why not write $\sqrt{3}2$?
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35
Best Fake Proofs? (A M.SE April Fools Day collection)
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28
Are there infinite sets of axioms?
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25
Is it possible to have a rule which generates: 2, 4, 6, 8, 10, 12, 14, 16, -23?
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24
Can $2^n$ and $2^{n+1}$ have the same digit sum?
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23
Comparing $2013!$ and $1007^{2013}$
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21
Why is the last digit of $n^5$ equal to the last digit of $n$?
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20
What is the limit of $n \sin (2 \pi \cdot e \cdot n!)$ as $n$ goes to infinity?
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18
Olympiad calculus problem
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17
What's the precise meaning of imaginary number?
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17
Why is $x^3-5x$ injective on the rationals?
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16
Find $n$ where $n^n$ has $n$ digits
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16
$n+1$ is a divisor of $\binom{2n} {n}$
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16
Can $\sin n$ get arbitrarily close to $1$ for $n\in\mathbb{N}?$
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15
$\displaystyle \lim_{x\to 0} \frac{e^{2x}-1}{3x} $ help please?
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15
Complex roots of $z^6 + z^3 + 1 = 0$
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14
Compute $\lim\limits_{n\to\infty} \int_{0}^{2\pi} \cos x \cos 2x\cdots \cos nx \space{dx}$
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14
Find the number of pairs $(m, n)$ of positive integers such that $\frac{ m}{n+1} < \sqrt{2} < \frac{m+1}{n}$
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13
What is the sense of the equality sign =?
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13
Everything is equal
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11
For which n are there primitive Pythagorean triples with legs of lengths a and a+n?
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11
How to explain this paradox involving coin-tosses?
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11
Infinite Series: Fibonacci/ $2^n$
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11
What's the proof that the Euler totient function is multiplicative?
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11
How to solve this recurrence relation $a_{n+2} = \sqrt{a_{n+1}\cdot a_{n}}$?
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11
Solving $n!+m!+k^2=n!m!$ for positive integers $n,m,k$
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10
ArcTan(2) a rational multiple of $\pi$?
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