What does $1+2+3+...=-\frac{1}{12}$ mean?
56169
What mistakes, if any, were made in Numberphile's proof that $1+2+3+\cdots=-1/12$?
122020
What is the remainder when $1! + 2! + 3! +\cdots+ 1000!$ is divided by $12$?
111221
Parenthesis in expr arithmetic: 3 * (2 + 1)
24068
Plus-minus sign in the continued fraction
49028
Find the sum : $\frac{1}{\cos0^\circ\cos1^\circ}+\frac{1}{\cos1^\circ \cos2^\circ} +\frac{1}{\cos2^\circ \cos3^\circ}+......+$
58773
What does the operation c=a+++b mean?
13085
Evaluate $ 1 + \frac{1}{3}\frac{1}{4}+\frac{1}{5}\frac{1}{4^2}+\frac{1}{7}\frac{1}{4^3}+\dots$
4971
$\int_{0}^{1}\frac{1-x}{1+x}.\frac{dx}{\sqrt{x+x^2+x^3}}$
85287
Prove that, for $p > 3$, $(\frac 3p) = 1$ when $p \equiv 1,11 \pmod{12}$ and $(\frac 3p) = -1$ when $p \equiv 5,7 \pmod{12}$
128415
Prove that $1<\frac{1}{1001}+\frac{1}{1002}+\frac{1}{1003}+\dots+\frac{1}{3001}<\frac43$
158210
showing $\arctan(\frac{2}{3}) = \frac{1}{2} \arctan(\frac{12}{5})$
54753
What does $\sum_{i=1}^{10} 2$ mean exactly?
29190
$\left\lfloor \frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\frac{1}{\sqrt{4}}+...+\frac{1}{\sqrt{1024}}\right\rfloor =?$
120430
A question about how to express a fraction as ${1\over q_1}+{1\over q_2}+ \cdots+{1\over q_N}$
80648
What's $(-1)^{2/3}\; $?
151930
What does it mean by $t=-1$?
113250
If $x+{1\over x} = r $ then what is $x^3+{1\over x^3}$?