31313...31313 (51-digits)

This number is a prime.

3 1313131313 1313131313 1313131313 1313131313 1313131313

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The first smoothly undulating palindromic prime after 313 formed from the digits 1 and 3. [Bajpai]

Submitted: 2019-03-29 16:59:46; Last Modified: 2020-06-18 13:17:47.