Excursions in Number Theory (Dover Books on Mathematics) cover
Excursions in Number Theory (Dover Books on Mathematics)
by C. Stanley Ogilvy
ISBN: 0486257789
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prezjordan · 2013-11-20 · Original thread
I first read it a few years back in Excursion's in Number Theory [0]. Super approachable (and short!), I read it in high school with only a little bit of calculus knowledge.

[0]: http://www.amazon.com/Excursions-Number-Theory-Dover-Mathema...