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Mathematics
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user19405892
  • Member for 8 years, 9 months
  • Last seen more than 3 years ago
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31
Prove that $\sin(2^n \alpha)$ can be arbitrarily small
Feb 19, 2017
17
How many values does the expression $1 \pm 2 \pm 3 \pm \cdots \pm n$ take?
Apr 30, 2016
16
Prove that $\frac{p^p-1}{p-1}$ is not prime if $p \equiv 1 \pmod 4$
Nov 3, 2016
14
Volume of tetrahedron using cross and dot product
Jan 7, 2016
13
The maximum number of perfect squares that can be in an arithmetic progression
Nov 20, 2016
13
Decompose $5^{1985}-1$ into factors
Jul 20, 2016
12
Show that $u_1^3+u_2^3+\cdots+u_n^3$ is a multiple of $u_1+u_2+\cdots+u_n$
Jul 15, 2016
12
Prove that if a prime $p$ divides $5^n-2$ and $2^n-5$, then $p = 3$
Dec 26, 2016
12
Prove that there exists a prime $p$ such that $p \mid a^n-b^n$ and $p > n$
Jul 1, 2017
11
Show that $a_n = [n \sqrt{2}]$ contains an infinite number of integer powers of $2$
Jul 20, 2016
Top network posts
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12
Aligning three columns of equations
7
Aligning vertical dots
6
Aligning sets of equations