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English is not my native tongue. German is not my native tongue. French is not my native tongue.
1d

comment 
how to calculate the sum of remainders of N?
Please use TeX properly on this site. Also, it is not clear what you mean by "reminder" as there are different conventions around (e.g. the residue of 7 modulo 4 equals 1). 
1d

comment 
Parabolic subgroup
Please use TeX on this site. 
1d

comment 
Weyl group representation
Please use TeX on this site. 
Jan 26 
comment 
Parametric solutions of Pell's equation
Well, saying that "$n=13$ belong to two series" suggests that you fix $n$ and look for parametric solutions of $a^2nb^2=1$ in the remaining variables $a$ and $b$. Perhaps saying that the "initial value $n=13$ belongs to two series" would be more appropriate. This just a language thing, of course, because your question is clear about what you are after. 
Jan 26 
comment 
Parametric solutions of Pell's equation
I think it is misleading to say that $n=13$ belongs to two series. Changing the parameter $k$ in your example changes all three variables in the Pell equation $a^2nb^2=1$, including $n$. 
Jan 25 
revised 
References for general HasseWeil zeta function
edited tags 
Jan 25 
revised 
Shortest/Most elegant proof for $L(1,\chi)\neq 0$
edited tags 
Jan 24 
comment 
RankinSelberg convolution and product of degrees
@paulgarrett: You should turn your comment into answer, so that this question can be closed. Perhaps you can mention the pairs $(n,n')$ when we know the statement. 
Jan 23 
revised 
Can a graph be reconstructed from its cycle lengths?
edited tags 
Jan 23 
revised 
Finding the greatest (smallest) factor of a number smaller (greater) than another number
edited tags; edited title 
Jan 22 
comment 
Has this formula about prime gaps already been conjectured and/or proven?
@YaakovBaruch: It is common to use this notation where higher iterates of log frequently occur, e.g. in certain branches of number theory and combinatorics. For example, Maynard's paper (arxiv.org/abs/1408.5110) uses this notation. 
Jan 22 
comment 
Has this formula about prime gaps already been conjectured and/or proven?
@TerryTao: You beat me by a few seconds, and of course your answer is better because it builds on earlier results. 
Jan 22 
answered  Has this formula about prime gaps already been conjectured and/or proven? 
Jan 22 
revised 
Fixed field of the Nebentypus of a newform for $\Gamma_1(N)$
edited tags 
Jan 20 
comment 
Is $ a^2b^2abap$ a perfect square for suitable $a,b\in \mathbb{Z}^+$?
@KasperAndersen: Thank you! I am somewhat surprised, but I admit I have little experience with the ErdősStraus conjecture. 
Jan 20 
comment 
Mean value of Maass forms
For clarity I would add after your last sentence the following. "This way one can see that for any $\epsilon>0$ we have $\limsup_{j\to\infty}\langle\phi_j,\chi_A\rangle\leq\epsilon$, whence $\lim_{j\to\infty}\langle\phi_j,\chi_A\rangle=0$." 
Jan 20 
comment 
Is $ a^2b^2abap$ a perfect square for suitable $a,b\in \mathbb{Z}^+$?
@TerryTao: Very interesting, thank you! 
Jan 20 
revised 
Is $ a^2b^2abap$ a perfect square for suitable $a,b\in \mathbb{Z}^+$?
deleted 2 characters in body; edited title 
Jan 19 
revised 
Is $ a^2b^2abap$ a perfect square for suitable $a,b\in \mathbb{Z}^+$?
deleted 11 characters in body 
Jan 19 
comment 
Is $ a^2b^2abap$ a perfect square for suitable $a,b\in \mathbb{Z}^+$?
After some thinking, I arrived at the following equivalent condition: there are positive integers $\ell$ and $m$ such that $m\mid\ell^2$ and $p+m\equiv 0\pmod{4\ell1}$. I think it is possible that a counterexample exists, but justifying it might be very difficult. By the way, your title is misleading as being squareful is different from being a square. 