23

This number is a prime.

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230 + 231 + 232 + 233 + 235 = 6449063 and the sum of 6 + 4 + 4 + 9 + 0 + 6 + 3 can be written as 3 * 2 + 2 * 2 + 2 * 2 + 3 * 3 + 0 + 3 * 2 + 3 = 32, the reversal of 23. [Gevisier]

Submitted: 1999-09-02 18:40:00;   Last Modified: 2008-02-10 20:33:27.
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