1 #n**0.5
 2 def comp(n,i):
 3     for i in range(2,int(n**0.5)+1):
 4         if(n%i==0):
 5             return False
 6     else:
 7         return True
 8 import time
 9 t=time.clock()
10 j=1
11 a=[2]
12 for n in range(3,100000,2):
13     if(comp(n,2)==True):
14         j=j+1
15         a.append(n)
16 print(j)
17 print("{}".format(time.clock()-t))
18 
19 #list9999900000--10000000000
20 def comp1(n,i):
21     for i in a:
22         if(n%i==0):
23             return False
24     else:
25         return True
26 import time
27 g=time.clock()
28 j=0
29 for n in range(9999900001,10000000000,2):
30     if(comp1(n,2)==True):
31         j=j+1
32 print(j)
33 print("{}".format(time.clock()-g))
34 
35 #list2-10000000000
36 def comp2(n,i):
37     for i in a:
38         if(i>int(n**0.5)+1):
39             return True
40         if(n%i==0):
41             return False
42     else:
43         return True
44 import time
45 k=time.clock()
46 j=1
47 for n in range(3,10000000000,2):
48     if(comp2(n,2)==True):
49         j=j+1
50 print(j)
51 print("{}".format(time.clock()-k))