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Top Questions
40 votes

Shortest terminating program whose output size exceeds Graham's number

code-golf math busy-beaver asked Jun 22, 2012 at 2:37
codegolf.stackexchange.com

31 votes

What is the millionth decimal digit of the $ 10^{10^{10^{10}}} $-th prime?

elementary-number-theory prime-numbers discrete-mathematics recreational-mathematics asked Oct 28, 2011 at 14:38
math.stackexchange.com

29 votes

Lifetime of a Worm

code-golf array-manipulation function asked Jan 19, 2014 at 18:11
codegolf.stackexchange.com

26 votes

Does iterating $n \to 2n+1$ always eventually produce a prime number?

number-theory prime-numbers asked Dec 25, 2011 at 20:50
math.stackexchange.com

26 votes

How many planar arrangements of $n$ circles?

combinatorics combinatorial-geometry asked May 31, 2015 at 21:11
math.stackexchange.com

26 votes

Make a Voronoi diagram (ASCII variant)

code-golf ascii-art asked Dec 26, 2013 at 0:59
codegolf.stackexchange.com

26 votes

Is string X a subsequence of string Y?

code-golf string decision-problem asked Apr 15, 2012 at 21:15
codegolf.stackexchange.com

25 votes

Do runs of every length occur in this string?

sequences-and-series asked Jul 24, 2014 at 14:10
math.stackexchange.com

25 votes

Always oddly-many ones in the binary expression for $10^{10^{n}}$?

elementary-number-theory computer-science discrete-mathematics asked Oct 5, 2011 at 15:53
math.stackexchange.com

18 votes

What is this 877-year cycle in the orbits of Jupiter & Saturn, and this multimillion-year cycle in the lunar orbit?

orbit the-moon jupiter saturn asked Mar 30 at 2:05
astronomy.stackexchange.com

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Top Answers
33
In what sense does a number "exist" if it is proven to be uncomputable?
math.stackexchange.com

24
Is it possible to plot a graph of any shape?
math.stackexchange.com

19
Function which creates the sequence 1, 2, 3, 1, 2, 3, ...
math.stackexchange.com

17
Represent a Uniform[0,1] random variable as a sum of independent Bernoulli(1/2) random variables
math.stackexchange.com

16
Busy Brain Beaver
codegolf.stackexchange.com

15
Is there a number so large that we could never calculate it?
math.stackexchange.com

14
Always oddly-many ones in the binary expression for $10^{10^{n}}$?
math.stackexchange.com

13
What are the odds of beating this obscure solitaire game?
boardgames.stackexchange.com

13
What is the millionth decimal digit of the $ 10^{10^{10^{10}}} $-th prime?
math.stackexchange.com

12
Polarization: etymology question
math.stackexchange.com

12
Graham's number expressed using xkcd's "Knuth Paper-Stack Notation"
math.stackexchange.com

11
Shortest code to produce infinite output
codegolf.stackexchange.com

10
Obfuscated Hello World
codegolf.stackexchange.com

9
How to fit a Weibull distribution to input data containing zeroes?
stats.stackexchange.com

9
How to find a formula for a non-obvious sequence of numbers?
math.stackexchange.com

8
Largest Number Printable
codegolf.stackexchange.com

8
How large is TREE(3)?
mathoverflow.net

8
Surprising identities / equations
math.stackexchange.com

8
How long will this take to reach.. kimye?
math.stackexchange.com

8
What is the highest number that can be got from 4383 by moving exactly 2 matches?
math.stackexchange.com

7
Nonsense from combining two iffs ($\iff$)
math.stackexchange.com

7
Approximating the variance of the integral of a white noise Gaussian process
math.stackexchange.com

7
Sum of consecutive square roots inside a square root
math.stackexchange.com

6
Probability that quadratic is an ellipse
math.stackexchange.com

6
Expected value: Random sequence
math.stackexchange.com

6
Have we found a Turing Machine for which halting/non-halting is unprovable?
math.stackexchange.com

6
What is the "pseudobinary" number system really called?
math.stackexchange.com

6
Probability of rolling a 1 before you roll two 2's, three 3's, etc
math.stackexchange.com

6
Turning 500, 1100, 1800, 2600, 3500, etc into 1, 2, 3, 4, 5, etc
math.stackexchange.com

6
Moments of a random variable in terms of its cumulative distribution function
math.stackexchange.com

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