23

This number is a prime.

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Kristen Eller ©2002
+ The sum of first 23 primes is 874 (a multiple of 23). Note that 874 = 23 * 38 and the 23rd prime is 83. [Poo Sung]

+ 23 = 05 + 14 + 23 + 32 + 41 + 50. [Poo Sung]

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