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Fixee
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199 votes
14 answers
501k views

How many sides does a circle have?

175 votes
6 answers
29k views

Deleting any digit yields a prime... is there a name for this?

58 votes
2 answers
4k views

Is $6.12345678910111213141516171819202122\ldots$ transcendental?

37 votes
6 answers
2k views

Need a result of Euler that is simple enough for a child to understand

24 votes
6 answers
6k views

How best to explain the $\sqrt{2\pi n}$ term in Stirling's?

23 votes
2 answers
1k views

Can we make $\tan(x)$ arbitrarily close to an integer when $x\in \mathbb{Z}$?

20 votes
3 answers
1k views

How many times do I roll an unfair die to determine its bias?

19 votes
2 answers
2k views

Shortest sequence containing all permutations

17 votes
1 answer
3k views

Is there a "good" way to visualize complex vectors?

11 votes
2 answers
318 views

What is the probability that $\pi(x) + x$ is injective?

9 votes
1 answer
1k views

How many expected people needed until 3 share a birthday?

8 votes
3 answers
3k views

Looking for intuition behind coin-flipping pattern expectation

8 votes
2 answers
1k views

Expected length of a sequence that contains all words of a given length.

8 votes
3 answers
1k views

Second pair of matching birthdays

6 votes
2 answers
449 views

Expected tail and head length of $\rho$ for a finite random function

6 votes
2 answers
246 views

Why are the periods of these permutations often 1560?

6 votes
1 answer
534 views

Is it ever really Pi Time?

5 votes
2 answers
166 views

Avoiding matching first digit of $a^n$ with $b^n$

5 votes
1 answer
1k views

A seeming paradox in a coin-flipping game

4 votes
2 answers
2k views

Derivation of $e$

3 votes
1 answer
289 views

Need "Live Birthday Paradox" algorithm

3 votes
3 answers
70 views

Approximation for $2^r\ln \frac{2^r}{2^r-r}$

3 votes
2 answers
2k views

Is it standard to say $-i \log(-1)$ is $\pi$?

3 votes
2 answers
4k views

What's the best way to factor a 256-bit number?

2 votes
2 answers
393 views

Why is this corollary a corollary? (Field extensions and symmetric polynomials.)

2 votes
2 answers
191 views

Why does $1234^{1234^{1234}\ \bmod\ 10^{10}}$ = $1234^{1234^{1234}\ \bmod \ \phi(10^{10})}$

2 votes
1 answer
313 views

What is the worst-case running time of this algorithm?

2 votes
1 answer
49 views

Would a parabolic cup stand upright?

1 vote
1 answer
118 views

Finding rational points at rational distance in the plane

1 vote
1 answer
909 views

Computing the integral of $e^{-x^2}$ over the entire line [duplicate]