1867

This number is a prime.

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There are only 1867 different summing equalities for numbers 1 to 11 where no value is used more than once: 1 + 2 = 3, 1 + 3 = 4, 2 + 3 = 1 + 4, etc. [Noll]

Submitted: 2009-07-04 07:54:37; Last Modified: 2026-06-24 22:01:33.