Integers and functional equation
47611
Integers and integer functions
103304
Finding the number of solutions to a diophantine equation
152001
Strings to Integers
21391
Proving Functions are Surjective
137816
Automorphism on integers
7802
Showing $\prod\limits_{i<j} \frac{x_i-x_j}{i-j}$ is an integer
144042
On the functional square root of $x^2+1$
136475
d'Alembert-like functional equation: $f(x+y)+g(x-y)=\lambda f(x)g(y)$
41002
sum of integers using order of integers and primitive roots
48502
number of ordered pairs of integers $(x,y)$ satisfying the equation
32599
Solution to the functional equation $f(x^y)=f(x)^{f(y)}$
136856
Diophantine equation with a prime number
146719
Functional equation $f(r \cos \varphi)+f(r \sin \varphi)=f(r)$
133646
real analysis -functional equation
62111
Functional Equation $f(mn)=f(m)f(n)$.
131586
Hard functional equation: $ f \big ( x y + f ( x ) \big) = f \big( f ( x ) f ( y ) \big) + x $
28594
Number of integer solutions of the following equation