These highway signs were in Tucson, Arizona. They were discovered on Pi Day 2009.

The highway signs say...

+-------------+ | I-10 I-19 | | 3 miles | +-------------+the numbers are: 10 19 3 the math is: sqrt(19 - 10) = 3 off-by-one rs42Eval: 10 * 3! - 19 = 42 - 1 * 42 is the "Answer to Life, the Universe, and Everything" number system math: sqrt(sqrt(19 - 3)) = 10_{2}number system math: 19 - 3 = 10_{16}

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 16 March 2009

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