10000...00003 (102-digits)

This number is a prime.

                                         10 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000003

+ 10^101 + 3 is the smallest prime containing exactly 100 zeros. [Gallardo]

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