解题思路:
注意事项:
参考代码:
a=int(input())
count=0
s=[]
for i in range(11,a+1):
for j in range(2,i):
if i%j==0:
break
else:
s.append(i)
for i in s:
s1=str(i)
if s1==s1[::-1]:
count+=1
print(count)
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