Sub-Number Primes

Look at the prime number 3137. If one digit
at a time is deleted, we generate the "sub-numbers" 137, 337, 317,
313. All four new of the sub-numbers are also prime,or
sub-primes. Are there any more 4-digit primes which behave in exactly the same way? |

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Last Updated: January 14th, 2010.