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2h

reviewed  Leave Open Elliptic curves with trace of Frobenius values always congruent to 0 modulo 2 
9h

reviewed  Looks OK Game on the tree 
11h

reviewed  Leave Closed Applications of infinite permutations 
11h

reviewed  Close Good Intermediate text on ODEs for selfstudy (meaning solved problems) 
22h

comment 
Exponential Sum Bound
Dougal's link is valuable of course, but it's amazing to me that a reference to the paper gets more upvotes here than a response by the author himself. 
1d

reviewed  Close Translation of the paper titled “ Quelques remarques sur les groupes de Lie algebriques reels” 
1d

reviewed  Leave Open Prime order elements in $GL(n,\mathbb{Z})$ 
1d

reviewed  Close Applications of infinite permutations 
1d

reviewed  Leave Open An angledoubling trick of Kirillov and Berenstein 
2d

comment 
Dynamics in the integers  Floor function
For the second part use Weyl's equidistribution theorem which shows that the limit is $1\alpha N$. 
2d

reviewed  Leave Closed Proof without words for surface area of a sphere 
Aug 26 
comment 
Finding integer points on elliptic curves via divisibility conditions like $(a+b)^2 \mid (2b^3+6ab^21)$
I think $k$ is a about size $b$, which is roughly $\ellm$. Knowing that this is at least $5$ doesn't help, or hurt, the computations of GH from MO. In the notation of the original question, GH from MO's computations have disproved the conjecture if the condition had been $b<a<8b$. 
Aug 25 
awarded  Nice Answer 
Aug 25 
reviewed  Looks OK if V(f) is irreducible, then how to show that the polynomial f itself is irreducible? 
Aug 25 
reviewed  Close if V(f) is irreducible, then how to show that the polynomial f itself is irreducible? 
Aug 25 
comment 
Finding integer points on elliptic curves via divisibility conditions like $(a+b)^2 \mid (2b^3+6ab^21)$
@GHfromMO: Your values seem to give $C$ more like $0.04$ rather than $0.4$? (I mean the $C$ in the $C \log x$ of my answer.) This is why I thought there may be a typo there. 
Aug 25 
comment 
prime number sequence and the tendency
Seems to me like a duplicate of mathoverflow.net/questions/164936/… . Is that roughly what you want to ask? 
Aug 25 
comment 
Finding integer points on elliptic curves via divisibility conditions like $(a+b)^2 \mid (2b^3+6ab^21)$
@GHfromMO: That's very nice! If we think of a Poisson process, then maybe one expects to find no counterexample around size $10^{10}$ with probability $1/e$, and finding no counterexample of size $10^{20}$ with probability $1/e^2$ etc. Also, I'm not completely sure of the numerical value you give for $C$  maybe a typo somewhere? (If $C$ is really as big as $0.4$ wouldn't you expect counterexamples sooner?) 
Aug 25 
reviewed  No Action Needed What is the correct statement of this ErdösGallaiTuza problem generalizing Turan's triangle theorem? 
Aug 25 
revised 
Finding integer points on elliptic curves via divisibility conditions like $(a+b)^2 \mid (2b^3+6ab^21)$
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