This road sign is on OR Hwy-212 two miles from Boring, Oregon.

The road sign says...

+-----------------+ | ^ Gresham 7 | | | Portland 21 | |-----------------| | S.E. 312th Av. | <-- strange abbreviation for Avenue | Sandy 5 | | Mt. Hood 39 | +-----------------+the numbers are: 7 21 312 5 39 the math is: (21 / 7 + 5) * 39 = 312 observe... 21 / 7 = 3 3 + 5 = 8 8 * 39 = 312 [exercise] list the prime factors of 312 [solve for n] (21 / n + 5) * 39 = 312Across the road (OR Hwy-212) from the Mt. Hood sign was a road sign indicating we were Two miles from Boring.

RoadHacker Nanofoo: Mt. Hood | from plane

## Update::2009.04.09

This BARS was selected to be one of the BARS of the Week for week #12 of the spring 2009 semester.

the numbers are: 7 21 312 5 39 more math: sqrt(312 + 5 + 7) + 21 = 39 the math is: cuberoot((312 / 39)! / 7!) = sqrt(sqrt(21 - 5)) rsPiEval: (21 + log(5 * cuberoot(312 / 39))) / 7 = Pi * 22/7 approximates Pi (3.14) rounded to nearest hundredth rs42Eval: sqrt(5! / (312 / 39) + 21) * 7 = 42 * 42 is the "Answer to Life, the Universe, and Everything" rsHwyEval: 312 - (38 + 21 + 8! / 7! * 5) = 212 * This road sign was found on OR Hwy-212## Update::2009.07.26

This BARS was selected to be one of the BARS of the Week for week #1 of the fall 2009 semester.

the numbers are: 7 21 312 5 39 BARSfunc rsAgeEval: spf(312) + 39 - 21 + 7 + 5 = 52 * MathBabbler was 52 years young when he found this equation. * spf(n) = the sum of the prime factors of n * spf(312) = 2+2+2+3+13 = 22 BARSfunc rs42Eval: spf(312) + 39 - 21 + 7 - 5 = 42 * 42 is the "Answer to Life, the Universe, and Everything" off-by-one rsStateEval: summation(5, 312 / 39) + (21 / 7)! = 33 - 1 * This sign is in Oregon and Oregon was the 33rd state admitted to the Union. * summation(5, 312 / 39) = summation(5, 8) = 5+6+7+8 = 26## Update::2010.08.19

This BARS was selected to be one of the BARS of the Week for week #1 of the fall 2010 semester.

the numbers are: 7 21 312 5 39 BARSfunc math: (7 + spf(spf(21)) - spf(spf(312))) * 5 = spf(spf(spf(spf(39)))) * spf(n) = the sum of the prime factors of n * spf(21) = 3+7 = 10; spf(10) = 2+5 = 7 * spf(312) = 2+2+2+3+13 = 22; spf(22) = 2+11 = 13 * spf(39) = 3+13 = 16; spf(16) = 2+2+2+2 = 8 spf(8) = 2+2+2 = 6; spf(6) = 2+3 = 5 off-by-one rsAgeEval: 21 + 5 * 7 - cuberoot(312 / 39) = 53+1 * MathBabbler was 53 years young when he found this equation.

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

**Created:** 02 August 2006

This work is licensed under a Creative Commons Attribution 3.0 United States License.