Originally, this question was way too wide open. I have tried to clarify / narrow it down / restrict the possibilities. Let me know if it is still too wide open.
These are some number sequences. I used the data set $A$ to generate both $B$ & $C$. I then compared those data sets in one way to get $D$ and in another way to get $E$.
Can you find $B$ and $C$?
A: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 B: ? C: ? D: 2,3,0,2,1,2,2,1,1,2,2,1,2,2,2,2,2,2,2,3,2,3,0,2,1,2,2,1,1,3 E: 0,1,3,4,2,3,5,5,3,3,6,4,8,8,7,7,9,8,8,5,6,7,9,10,8,9,11,11,9,5
The methods to generate $B$ & $C$ do not use any mathematical operators.
The methods to generate $D$ & $E$ use the operators $+$ & $-$ and nothing else.
All numbers are whole numbers.
If you were to look at it another way, it might looks like this:
Find $f_B$ & $f_C$ where: $$n=1\to30$$ $$A_n=n$$ $$B_n=f_B(A_n)$$ $$C_n=f_C(A_n)$$ $$D_n=f_D(B_n,C_n)$$ $$E_n=f_E(B_n,C_n)$$