73

This number is a prime.

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Smallest emirp partial sum of tetrahedron-tree numbers: 1 + 2 + 5 + 6 + 9 + 15 + 16 + 19 = 73. [Post]

Submitted: 2010-05-02 00:05:47;   Last Modified: 2010-05-02 11:33:13.
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