$4$ different square numbers can't create an arithmetic sequence.
18932
Squares in arithmetic progression
59653
$x^2-y^2=2s$, s cannot be an odd integer
19
Why is the square root of a sum not equal to the square root of each its addends?
45911
Prove that none of $\{11, 111, 1111,\dots \}$ is the perfect square of an integer
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
78407
Are there infinitely-many numbers that are both square and triangular?
153709
Can't start a numbered list on a number other than 1
107121
Integer solutions to combinations of floating point numbers
147924
Math problems that are impossible to solve
44936
Combinatorics - How many numbers between 1 and 10000 are not squared or cubed?
21665
why division by zero is not possible
4946
Non-existence of irrational numbers?
109305
Non-existence of natural numbers such that $\sqrt{n} +\sqrt{n+1} <\sqrt{x} +\sqrt{y} <\sqrt{4n+2}$
28579
Creating a sequence that does not have an increasing or a decreasing sequence of length 3 from a set with 5 elements
71935
Let $k$ be a natural number . Then $3k+1$ , $4k+1$ and $6k+1$ cannot all be square numbers.
99606
Prove or disprove there exists a set of four numbers out of the $48$ positive integers of which product is a perfect square
68315
Why doesn't multiplying square roots of imaginary numbers follow $\sqrt{a} \times \sqrt{b} = \sqrt{ab}$?