1747

This number is a prime.

The year J. S. Bach visited Frederick the Great in Potsdam, and later sent his Musical Offering as a thank-you note. He arrived there on the prime date of May 7th and published that music on the prime date of July 7th. 1747 contains 17 and 47, which JSB would have noticed. The main theme has 5 + 5 + 11 notes, and appears in measures 47 and 229 of the 2nd movement and measure 23 of the last movement of the sonata. It contains 5 + 5 canons. [Bodine]