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import math
def isPreme(smk):
i = 2
for i in range(2, smk):
j = 2
for j in range(2, int(math.sqrt(i)+1)):
if (i % j == 0):
break
else:
print('%sæ¯ç´ æ°' % i)
isPreme(20)
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2æ¯ç´ æ°
3æ¯ç´ æ°
5æ¯ç´ æ°
7æ¯ç´ æ°
11æ¯ç´ æ°
13æ¯ç´ æ°
17æ¯ç´ æ°
19æ¯ç´ æ°