10000...00007 (57-digits)

This number is a prime.

              1000000 0000000300 0000000000 0500000000 0000090000 0000000007

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The only prime less than a googol formed by inserting the same number n of zeros, (n=13), between the digits of the smallest odd-digit prime (emirp), that consists of all of the odd digits, i.e.,13597. [Loungrides]