Show that the numbers 1, 2, 3, ..., 16 can be arranged in a line so that the sum of any of two neighbors is a square.
38018
Arrangement of integers in a row such that the sum of every two adjacent numbers is a perfect square.
37783
Proving that a set of 2016 natural numbers contain a non-empty set with a sum divisible by 2016
105564
If $n$ is a positive integer greater than 1 such that $3n+1$ is perfect square, then show that $n+1$ is the sum of three perfect squares.
90904
Combinatorial proof of an identity with squared binomial coefficients
47550
Number of distinct arrangements {$n_i$} $n_1<n_2<n_3<n_4<n_5$ such that $\sum n_i=20$
74505
3 square in a circle (geometric question)
93948
Is my proof correct? $p_1p_2p_3\cdots p_n+1)$ cannot be the square of an integer
75852
Using Pigeonhole Principle to prove two numbers in a subset of $[2n]$ divide each other
125702
There is a square $Q$ consisting of $(0,0), (2,0), (0,2), (2,2)$
101835
Which rationals can be written as the sum of two rational squares?
129755
Weighted sum of squares, in a finite field
377
Problem involving many squares and several variables.
146333
Gaussian proof for the sum of squares?
84700
Give the three numbers that form a geometric sequence.
7073
How to get to the formula for the sum of squares of first n numbers?
20443
Calculate sum of squares of first $n$ odd numbers
18932
Squares in arithmetic progression