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WhatsUp
  • Member for 8 years, 11 months
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Top posts
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33
On the polynomial $\sum_{k=0}^n\binom{n}{k}(-1)^kX^{k(n-k)}$
Mar 28, 2018
25
The $2\pi$ in the definition of the Fourier transform
Mar 23, 2017
23
A finite alternating sum
Oct 27, 2019
20
Inverse of special upper triangular matrix
Aug 29, 2017
19
Harmonic sums and elementary number theory
Dec 1, 2019
14
Generalizing a problem to make it easier
Jul 5, 2020
13
Is it true that $\sum_{k=m}^n\frac{\sigma(k)}k\not\in\mathbb Z$ for all derangements $\sigma\in S_n$ and $1\le m\le n$?
Nov 27, 2018
9
Average size of extreme points of convex hull of $N$ points
Jun 20, 2017
9
Is an integral sum of periodic vectors always a sum of integral periodic vectors?
Sep 19, 2019
9
There at least 4 divisors of $n-1$ which do not divide $\phi(n)$ if $n$ is a composite of the form $6k+1$
Jul 29, 2016
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27
Right-Turn-Only Maze
26
The "Loop of rope" dilemma
26
Which person is telling the truth?
21
Prime tree game
21
Amoebas escaping the prison