Can 2017 be written uniquely as a sum of 2 squares?
15725
$2017$ as the sum of two squares
853
Write down the sum of sum of  sum of digits of $4444^{4444}$
86168
Is $2^k = 2013...$ for some $k$?
18064
Sum of reciprocals of numbers with certain terms omitted
142882
Can the factorial function be written as a sum?
95103
A rational matrix such that $A^{2017}=I_n$
143540
How to prove this decomposition of sum of squares?
140433
The number of ways of writing an integer as a sum of two squares
67332
Sum of two squares modulo p
140008
I need help with a double sum
28781
$k^{2}+(k+1)^{2}$ being a perfect square for infinitely many $k$
149267
Complete the square on cross terms?
65505
Any way to do DISTINCT ON?
1739
Adding two numbers concatenates them instead of calculating the sum
134765
Is an integer a sum of two rational squares iff it is a sum of two integer squares?
80671
Product of sums of square is a sum of squares.
4559
How many ways can $133$ be written as sum of only $1s$ and $2s$