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Tong Lingling's user avatar
Tong Lingling's user avatar
Tong Lingling's user avatar
Tong Lingling
  • Member for 1 year, 11 months
  • Last seen this week
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Top posts

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20
Where did this Pólya's theorem appear?
May 7, 2025
13
Six consecutive positive integers with certain shape
Mar 23, 2024
10
An identity related to sum of two squares
2 days ago
6
Elementary question about a biquadratic Diophantine equation
Jan 8, 2025
6
Find the smallest odd integer $n>1$ such that $\phi(\tau(n))=\tau(\phi(n))$
Jan 9, 2025
6
Six consecutive positive integers with certain shape
Mar 25, 2024
5
Is there a Carmichael number $n$ satisfying $\sigma(n)\equiv0 \pmod{n+1}$?
Apr 25, 2025
4
Do all nonnegative integers appear in A051521?
Mar 26, 2024
4
A limit related with sum of digits
Apr 30, 2025
3
Is there an extension of Lindström's theorem to base $b>2$?
Dec 26, 2025

Top network posts

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9
Binomial coefficients sum $\sum_{k=1}^{n} \frac{1}{k}\binom{2k}{k}$ when $n>1$, $p=2n+1$ is a prime