[Python] Finding prime number with Python

I have following snippet which finds numbers which are not co-prime to 20. But, I want to achieve the opposite i.e. printing the prime numbers. It should be achieved with something like (((i%j)!==0) & ((z%j)!==0)). I am new to python and hence not sure about the syntax of "!". Can someone edit the code so that it prints the prime numbers?

#Finding co prime of a number (e.g.20)
k=0
z=20
for i in range(3,31):
for j in range(2,30):
if(((i%j)==0) & ((z%j)==0)):
k=k+1
if(k==1):
print(i) #the printed number is not co prime to 20
k=0


Following is the output of the code snippet:

4
5
6
8
10
12
14
15
16
18
20
22
24
25
26
28
30

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