Saturday, April 16, 2011

Prime palindromes with this property

An odd-odd number is a positive integer all of whose digits are odd.

How many integers < 10,000 are prime palindromes but not odd-odd?
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1 comment:

  1. PaulApril 18, 2011 at 3:21 AM

    I reccon there are 7,

    2,101,181,383,727,787,929.

    Paul.

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