- from math import sqrt 
-   
- count = 1 
- i = 1 
- while count < 3000: 
-         i += 2 
-         for k in range(2, 1+int(sqrt(i+1))):    #range(2, i):    
-             if i%k == 0:        
-                 break 
-         else: 
-             #print(i) , 
-             count += 1 
-             #if count%20==0: print "" 
- print i 
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