Is there an easy way to see that this simple recurrence is 9-periodic?
99782
$a_{n+1}=|a_n|-a_{n-1} \implies a_n \; \text{is periodic}$
61477
How do I resolve a recurrence relation when the characteristic equation has fewer roots than terms?
68971
Elementary approach to proving that a group of order 9 is Abelian
144772
Is there a recurrence relation which has no closed formula?
148703
Permutations with repeating digits
4031
What is the solution to the following recurrence relation with square root: $T(n)=T (\sqrt{n}) + 1$?
121248
How to solve this recurrence $T(n) = 2T(n/2) + n\log n$
144331
Periodic function implies periodic primitive?
109189
Periodicity of a triginometric function
50515
Solving a recurrence relation: $T(n^6) = 9T(n^{\frac{1}{6}}) + \log^2(n)$
72718
Recurrence formula for division of a sphere by n great circles
64592
The last two digits of $9^{9^9}$
30273
Fibonacci Recurrence Relations
17371
Recurrence relation for number of ternary strings that contain two consecutive zeros
144890
Recurrence $f_{n+2}=af_{n+1}+bf_n$
24019
Solving Recurrence Relation Denominator
50444
Laguerre polynomials recurrence relation