103

This number is a prime.

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103 is the smallest prime not found in the first thousand digits of π. These digits of π count the initial digit "3" and 999 decimal digits. Note that the same applies to the prime 107 while the prime 109 already appears in the first thousand digits of π. [Rivera]

103 is the sum of the prime factors of 103 + 301. Found by Emmanuel Vantieghem for Puzzle 1255. [Rivera]