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user123

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 7 years, 10 months
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  • Last seen Feb 20 at 7:09

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8 Prove that $c_n = \frac1n \bigl(\frac{1}{\sqrt{2}} + \frac{1}{\sqrt{3}} + \cdots + \frac{1}{\sqrt{n}} \bigr)$ converges Dec 16 '14
6 For any integer $n>1$ exist integers $a$ and $b$ so that $\tau(a)+\tau(b)=n$ Jul 21 '15
6 Say $A^2 = 0$. Prove that for every real number $a$, the matrix $I + a A$ is invertible May 2 '17
5 $p^3 + 2$ is prime if $p$ and $p^2 + 2$ are prime? Nov 16 '14
5 A number guessing game May 9 '13
5 Using the definition of limit, prove $\frac{x+1}{x+2}\to 1$ as $x\to\infty$ Jan 6 '15
4 What is the appropriate substitution for this equation? Jan 1 '15
4 Finding the formula of sum $(k+1)^2+(k+2)^2+…(k+(n-1))^2$ Jan 10 '15
4 If $p$ is a prime and $a^2 ≡ 1$(mod $p$), prove that $a ≡ ± 1 $(mod $p$) Feb 20 '16
3 Nasty Limit of sum at infinity Jan 10 '15
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