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coffeemath
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15
$3\times3$ matrix of distinct positive primes with determinant $0$
Feb 1, 2018
14
Simple graph with 6 vertices and 11 edges
Jan 12, 2018
12
Catalan numbers and triangulations
Jul 30, 2018
12
can the product of four positive integers in A.P. be a square?
Apr 22, 2019
10
How is this differential equation solved?
Feb 25, 2022
9
Since $\zeta(1) \neq 1$, does this mean that $\zeta$ is not multiplicative?
Jan 8, 2019
9
Are there incongruent pythagorean triangles with the same perimeter and same area?
Apr 10, 2019
9
About Group Homomorphisms
Sep 12, 2018
9
For which $n$ does $\binom{2n}{n}$ divide $\binom{4n}{n}$?
Sep 2, 2019
8
Find the remainder when $99!+99$ is divided by $100$
Feb 6, 2019
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