编辑代码

def ss(i):
    for j in range (1,i):
        if i%j==0:
            return False
    return True
def hw(i):
    x=i
    k=0
    while x!=0:
        k=k*10+x%10
        x=x//10
    if k==i:
        return True
    else:
        return False
n=int(input())
for i in range(2,n+1):
    if ss(i) and hw(i):
        print(i)