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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, 4 months
  • Last seen this week
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Top posts
14
Where did this theorem appear?
2 days ago
13
Six consecutive positive integers with certain shape
Mar 23, 2024
6
Elementary question about a biquadratic Diophantine equation
Jan 8
6
Find the smallest odd integer $n>1$ such that $\phi(\tau(n))=\tau(\phi(n))$
Jan 9
6
Six consecutive positive integers with certain shape
Mar 25, 2024
4
Do all nonnegative integers appear in A051521?
Mar 26, 2024
4
A limit related with sum of digits
Apr 30
2
Question on digital sum of the square of $n$
Jan 4, 2024
2
Prime products and powers
May 5
0
Is there a Carmichael number $n$ satisfying $\sigma(n)\equiv0 \pmod{n+1}$?
Apr 25
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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