primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
73, 79, 83, 89, 97, 101, 103, 107, 109, 113,
127, 131, 137, 139, 149, 151, 157, 163, 167, 173,
179, 181, 191, 193, 197, 199, 211, 223, 227, 229,
233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
283, 293, 307, 311, 313, 317]
def isPrime(x) :
global primes
for p in primes :
if x%p==0 :
return False
return True
d = 7
v = d * 111
for a in range(0,10):
for b in range(0,10):
x = v*100+a*10+b
if isPrime(x) :
print x
if a!=d and b!=d :
x = a*10000+v*10+b
if isPrime(x) :
print x
x = a*10000+b*1000+v
if isPrime(x) :
print x
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