13131...13131 (25-digits)

This number is a prime.

13131 3131313131 3131313131

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The smallest palindromic prime greater than 131 formed by alternating 1 and 3. It has a square number of digits (25) and its sum of digits is also a square number (49). [Gallardo]

Submitted: 2003-12-31 18:20:54; Last Modified: 2008-01-30 17:28:00.