Ramanujan Summation's -1/12 is not an element of the group of all positive integers. Does this prove the summation wrong?
141357
Is $1+2+3+4+\cdots=-\frac{1}{12}$ the unique ''value'' of this series?
6837
How to quotient $\mathbb Z [\sqrt{-11}] / (1+\sqrt{-11})$?
101349
$-1$ isn't a quadratic residue $\pmod{p}, p=4k+3$.
146439
Is every sufficiently large positive integer of the form $ab + ac + bc + 1$?
32524
Flawed proof that all positive integers are equal
140763
How to prove that $\sum_{n=1}^{2012} \frac{1}{x_n} = 1 $ has finitely many solutions for positive integer $x_i$?
104917
Is $\sqrt1+\sqrt2+\dots+\sqrt n$ ever an integer?
16172
My proof of $I \otimes N \cong IN$ is clearly wrong, but where have I gone wrong?
20003
Prove for positive integers a,b,c and d (where b does not equal d), if gcd(a,b) = gcd(c,d) = 1, then a/b + c/d is not an integer
26154
Motivation for Ramanujan's mysterious $\pi$ formula
143343
The series of reciprocals of the integers that do not contain 9 in their decimal representation
118571
Why is $\sum\limits_{k=0}^{n}(-1)^k\binom{n}{k}^2=(-1)^{n/2}\binom{n}{n/2}$ if $n$ is even?
48363
Nested Radical of Ramanujan
64941
Why is $1 - \frac{1}{1 - \frac{1}{1 - \ldots}}$ not real?
41002
sum of integers using order of integers and primitive roots
51861
$S_4$ is not isomorphic to $D_{12}$
140458
Infinite summation involving exponents