This "no dogs" sign is in Pacific Beach, California.

The No Dogs sign says...

+--------------------------------+ | NO DOGS | | On the Beach, Boardwalk, | | Park Areas, Cliffs and | | adjacent Parking Lots | | Nov. 1 to Mar. 31 9am to 4pm | | Apr. 1 to Oct. 31 9am to 6pm | ---------------------------------- | Dogs are allowed all other | | times and must be leashed | | at all times. | | Please clean-up after your pet | +--------------------------------+the numbers are: 1 31 9 4 1 31 9 6 the numbers sorted: 1 1 4 6 9 9 31 31 the math is: 1 - 1 + 4 + 9 / 9 + 31 / 31 = 6 rsPhiEval: (31/31 + sqrt((4+6) / (1+1))) / (sqrt(9)! / sqrt(9)) = Phi * Phi is the golden ratio and it approximates 1.61803399 rsPiEval: (1 + 4 + 9 + 9 - 31 / 31) / (1 + 6) = Pi * 22/7 approximates Pi rounded to nearest hundredth (3.14) * 3.1415926535897932384626 rsCardinalityEval: ((31 - 1) - (31 - 9)) * (9 - 6) / (4 - 1) = 8 * There are eight numbers in this "no dogs" sign. rsStateEval: 31 * (31 - 9 - 9 - 6 - 4 - 1 - 1) = 31 * California was the 31st state admitted to the Union. rs37Eval: (31 + 31) / (1 + 1) + ((9 + 9) / 6 * sqrt(4)) = 37 * Whyrs37Eval? 37 Heaven @ http://thirty-seven.org rs42Eval: 31 + 31 - 9 - 9 - (6 + 1 + 1) / 4 = 42 * 42 is the "Answer to Life, the Universe, and Everything" rsAgeEval: 31 + 31 - ((9 - 1) / 4 * (6 / sqrt(9) + 1)) = 56 * RoadHacker was 56 years young when he found this sign. rsMaxTweetLenEval: 31 + 31 + 9 * 9 - log(6 + 4) - 1 - 1 = 140 * 140 is the maximum length of a Twitter posting (tweet).## Update::02018.01.11

MathBabbler saw "No Dogs" again at the start of 2018 when the

rsAgeEvalwas 60.the numbers are: 1 31 9 4 1 31 9 6 rsAgeEval: 31 + 31 - 6 + 4 * (1 - 1)! = 60 rsAgeEval: 31_{9}+ 31_{9}+ (1 + 1) * (6 - 4) = 60 rsAgeEval: 31 - 9 + 31 - 9 + 4! - 6 - 1 - 1 = 60 * MathBabbler was 60 years young when he found this equation. rsMaxTweetLenEval: 31 * 4 + 31 * 6 - (9 + 1) * sqrt(9^1) = 280 * After this BARS was created, Twitter increased the maximum tweet length from 140 to 280.

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

**Created:** 18 January 2014

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