This number is a prime.

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+ The composer Béla Bartók finished his Opus 19 in 1919, when he was 38 (twice 19) years old; the title in his native Hungarian (A csodálatos mandarin) has 19 letters. [Ace]

+ There are 19 visible diamond patterns on the surface of a fully formed rhombic triacontahedron when structured using a series of phi-ratio pyramids. An example being Roger von Oech's Ball of Whacks. [Trace]

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