31131...13113 (31-digits)

This number is a prime.

                                          3 1131131131 1311311311 3113113113

Just showing those entries submitted by 'Patterson': (Click here to show all)

+ A palindromic prime of prime length with prime digital sum that also has the property that each substring of adjacent digits of length 2 or 3 is also prime. [Patterson]

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