# 81517

This number is a prime.

The smallest prime formed from the concatenation (in increasing order) of integral edges of a right triangle (8-15-17). [Patterson]

At 8:15:17 a.m. on August 6, 1945, Colonel Ferebee pushed a
lever in his bomber (the *Enola Gay*) making sure an
automated system he had activated seconds earlier had
functioned.

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