# 43

This number is a prime.

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The smallest nontrivial *y* for which the Pellian *x*^{2} - 1847**y*^{2} = 1 is soluble. Note that 1847 is also prime. [Beedassy]

The number of distinct heptiamonds (i.e., triangular polyominoes with 7 cells), counted with reflections but not turning over. [Beedassy]

(There is one curio for this number that has not yet been approved by an editor.)

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