Numbers 180-189

A page of the Numeropedia - the Special Encyclopedia of Numbers

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180 (separate page

181

[Calendar]  The number of days of the first half (six months) of a year is either 181 (for non-leap year) or 182 (for leap year).

[Game]  The number of black pieces in the Go game; versus 180 white pieces. Go is called Weichi in China and Baduk in Korea.

[Math.]  A palindromic prime number.

[Math.]  Three square numbers using the same digits: 1542 = 23716, 1812 = 32761 and 2692 = 72361.

182

[Calendar]  The number of days of the first half (six months) of a year is either 181 (for non-leap year) or 182 (for leap year).

183

[Math.]  A square number 4282 = 183,184, formed by concatenation of 2 consecutive numbers. (The smallest such case).

184

[Calendar]  The number of days of the 2nd half (six months) of a year.

[Math.]  A square number 4282 = 183,184, formed by concatenation of 2 consecutive numbers. (The smallest such case).

[Money]  The 184-nation WorldBank traditionally has an Ameican president. (The International Monetary Fund traditionally has a European president.)

[Tech.]  The number of TRACONs (Terminal Radar Approach Control) in contagious United States.

[World]  The ISO country code for Cook Islands. (ISO-3166)

185

[Tech.]  Automobile tires used in the U.S. have tire section width of 145, 155, 165, 175, 185, 195, 205, 215, 225, 235, 245 or 255 (millimeters).

186

[Math.]  7,254 = 39×186, using each of 9 digits 1-9 once.

[Tech.]  Automobile Tire’s Speed Rating

 Tire Rating L M N P Q R S Max. Speed (mph) Max. Speed (kph) 75 120 81 130 87 140 93 150 100 160 106 170 112 180 Tire Rating T U H V W Y Max. Speed (mph) Max. Speed (kph) 118 190 124 200 130 210 149 240 168 270 186 300

186 & 187

[Calendar] The number of odd days in a year is 186 or 187 in the leap year.The number of even days in a year is 15×12–1 = 179.

187

[Math.]  1874 = 1,222,830,961 = (12+22+83+09+61)4.

188

[Math.]  1883 = 6,644,672 = (6+64+46+72)3.

[World]  The ISO country code for Costa Rica. (ISO-3166)

189

[Math.]  1893 = 6,751,269 = (67+51+2+69)3.

1894 = 1,275,989,841 = (1+27+59+89+8+4+1)4.

180-189

[Library]  Numbers 100-199 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Philosophy, Psychology and Ethics… Numbers 180-189 are for books in Ancient, Medieval and Oriental Philosophy.

100-199

[Education] The numbers commonly assigned for upper level undergraduate (last 2 years, junior and senior) courses in most U.S. universities and colleges.