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47
A challenging (for me) limit calculation
mathoverflow.net

37
Is the integral of $e^{-x^2}$ from $0$ to $1$ known to be irrational?
mathoverflow.net

31
A New Conjecture on an Upper Bound for the Next Prime
mathoverflow.net

30
Is there a "halting machine" which halts on itself?
mathoverflow.net

27
Is it a valid chemical?
codegolf.stackexchange.com

21
A power of 10 that is the sum of consecutive powers of 2?
mathoverflow.net

18
Output an infinitely proportional sequence
codegolf.stackexchange.com

17
Is the following problem NP-complete?
mathoverflow.net

16
Is This an Equivalence Relation?
codegolf.stackexchange.com

15
Could someone explain the proof of this formula clearly? I got the wrong values for spanning trees with this formula and with Cayley's formula
mathoverflow.net

13
Measure of closure of $\{\sigma(n)/n:n\in\mathbb{N}\}$ where $\sigma(n)$ is sum of divisors
mathoverflow.net

13
Rudin-Shapiro sequence
codegolf.stackexchange.com

13
Adjacent Items Sorting
codegolf.stackexchange.com

12
Are there any examples of exponential algorithms that use a polynomial-time algorithm for a special case as a subroutine (exponentially many times)?
cstheory.stackexchange.com

12
Exponential transform of an integer sequence
codegolf.stackexchange.com

12
Output greater than without the previous character
codegolf.stackexchange.com

12
Self-referencing tuple in python
codegolf.stackexchange.com

12
Reconstruct an array by successive insertions
codegolf.stackexchange.com

11
Monotone sequence beatitude
codegolf.stackexchange.com

11
Construct this point
codegolf.stackexchange.com

11
Two Parallel Linked Chains
codegolf.stackexchange.com

11
Is it a tetrate of two?
codegolf.stackexchange.com

11
Solve $\binom{n}{k}=m$ for $(n,k)$
mathoverflow.net

10
Divisor antichains whose sum equals the integer
mathoverflow.net

10
Does this weird sum involving (-1)^n / n² and log(n) converge to anything known?
mathoverflow.net

10
Find the fairest partition of a list
codegolf.stackexchange.com

10
Output every sublist ... eventually
codegolf.stackexchange.com

10
All sequences as substrings
codegolf.stackexchange.com

10
Count the cells
codegolf.stackexchange.com

10
Write a set as a union of ranges
codegolf.stackexchange.com

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