43

This number is a prime.

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The Frobenius number of the set {6, 9, 20}. Chicken McNuggets were once only available in lots of 6, 9, and 20. Therefore, 43 was the largest number of McNuggets you couldn't buy at that time!

Submitted: 2009-09-19 21:16:14; Last Modified: 2009-09-20 00:18:36.