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]

P = 103 is the largest emirp P known of the form 10^n + 3 such that the sum of the prime factors, without repetitions, of P (plus its reversal) is equal to P, i.e., for n = 2, 10^2 + 3 = 103 an emipr P = 103; 103 + 301 = 404; 404 = 2^2*101; 2 + 101 = 103. Something analogous occurs also for n = 1. Found by Emmanuel Vantieghem for Puzzle 1255. [Rivera]