Deyi Chen

Member for 3 years, 6 months
Last seen more than a week ago

Hangzhou, Zhejiang, China

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nt.number-theory

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Answers

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10

On Euler's elliptic curve for $A^4+B^4 = C^4+D^4$?

Oct 7, 2023

5

On $\frac{(-1)^{(n-1)/2}}n\mathrm{per}\left[\tan\pi\frac{j+k}n\right]_{1\le j,k\le n-1}$ with $n\in\{3,5,7,\ldots\}$

Aug 23, 2021

3

Set partitions and permanents

Sep 28, 2021

3

On finite products of $\frac{p+4}{p+2}$ with $p$ prime

Aug 24

1

On the parity of the sum $\sum_{1\le j<k\le p-1\atop p\nmid aj^2+bjk+ck^2}(aj^2+bjk+ck^2)$

Sep 12

Questions

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20

Euler numbers and permanent of matrices

Aug 26, 2021

12

Set partitions and permanents

Sep 22, 2021

9

Permanent identities

Sep 1, 2021

5

Permanents and Kummer-like congruence

Sep 25, 2021

4

A conjecture about 433

Sep 30, 2021

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nt.number-theory

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diophantine-equations

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elliptic-curves

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permanent

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matrices

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