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# 8191

This number is a prime.

Single Curio View: (Seek other curios for this number)

Suppose you listed all primes, with three digits or less,
using the digits in this number (1,8, and 9), without
limiting the number of times a number can use each digit
(i.e., it may have two nines). If they are now listed from
least to greatest with signs in the order "+, +, -,",
beginning with 11+18+19-181+191+199-811... the sum is 1381,
which is a prime as well. [Meiburg]
Submitted: 2009-07-10 10:51:34; Last Modified: 2009-07-10 18:27:33.

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