40000...00009 (33-digits)

This number is a prime.

                                        400 0000060000 0004000000 0800000009

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+ The only prime less than a googol formed by inserting the same number n of zeros between the digits of the smallest composite-digit prime that consists of all the composite digits, i.e., 46489, (case n=7). [Loungrides]

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