200 (separate page)

 

201

[Calendar]  The first year of the 3rd century.

 

[Library]  ISBN-0-201 is the International Standard Book Number for books published by Addison-Wesley.

 

[Math.]  Four square numbers using the same digits:

1022 = 10404, 1202 = 14400, 2012 = 40401 and 2102 = 44100.

 

[Math.]  Squares and cubes of 2 numbers using the same digits:

1022 = 10404 and 2012 = 40401 & 1023 = 1,061,208 and 2013 = 8,120,601.

 

[Math.]  Reversible numbers and their squares: 1022 = 10404 and 2012 = 40401.

 

[Phone]  The smallest number assigned for an NANPA/U.S. telephone area code: North New Jersey (Jersey City and Hackensack). The first digit of an NANPA/U.S. telephone area code cannot be 0 or 1. (NANPA: North American Numbering Plan Administration).

 

[Measure]  The number of meters (201.168m) in a furlong.

1 mile = 8 furlongs = 80 chains = 5280 feet = 8000 links = 63,360 inches. Chain (or Gunter’s chain or surveyor’s chain) is a unit used in surveying.

 

202

[Math.]  (Sequence of numbers 20…02)

2023 = 8,242,408 = (–8+242–40+8)3

 

[Phone]  The only telephone area code for Washington, D.C., U.S.

 

203

[Math.]  Three square numbers using the same digits:

1482 = 21904, 2032 = 41209 and 3022 = 91204.

 

[World]  The ISO country code for Czech Republic. (ISO-3166)

 

204

[Math.]  A pyramidal number (sum of all squares of integers from 1 to 8): 204 = 12+22+32+42+52+62+72+82.

 

[Math.]  The 4th square number that is also a triangular number: 2042 = 1+2+…+288 = 41616.The nth root number is 6 times the (n–1)th root minus the (n–2)th root: 1, 62, 352, 2042, 11892

 

[Math.]  204 = 32+72+52+112 = 22+82+62+102, where 3+7 = 2+8 and after adding 3 to each digit: 6+10 = 5+11.

 

[Math.]  Three square numbers using the same digits:

1082 = 11664, 1292 = 16641 and 2042 = 41616


[Math.]   2042 = 233+243+253 = 41,616. 

 

[World]  The ISO country code for Benin (was Dahomey). (ISO-3166)

 

205

[Library]  ISBN-0-205 is the International Standard Book Number for books published by Allyn and Bacon.

 

[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).

 

206

[Biology]  The number of bones in an adult body (including 3 tiny bones in each ear). Some bones fuse together from the original more than 300 bones at birth.

 

[Math.]  2063 = 8,741,816 = (8+7+4+181+6)3.

 

206 & 207

[Science]  Fujita Scale for Tornado

Scale, Intensity

Wind Speed

F0, Gale

40-72 mph

F1, Moderate

73-112 mph

F4, Devastating

207-260 mph

F2, Significant

113-157 mph

F5, Incredible

261-318 mph

F3, Severe

158-206 mph

F6, Inconceivable

319-379 mph

  

206 & 208

[Math.]  Squares of 2 consecutive even numbers using the same digits:

2062 = 42436 and 2082 = 43264.

 

207

[Math.]  2074 = 1,836,036,801, where 18360 and 36801 are mutual permutations.

 

[Math.]  Three square numbers using the same digits:

2072 = 42849, 2222 = 49284 and 2882 = 82944.

 

[Phone]  The only telephone area code for the state of Maine, U.S.

 

208

[Gov.]  Within any “leave year”, a U.S. government employee earns 4 hours (for 0-3 working years), 6 hours (3-15 years) or 8 hours (over 15 years) of “annual leave” for each of 26 leave periods of 2 weeks, respectively, for a total of 104, 160 (156 plus 4 extra hours for the last pay period within the calendar year) or 208 hours of “annual leave”, respectively.

 

[Math.]  2083 = 8,998,912 = (08+99+89+12)3.

 

[Phone]  The only telephone area code for the state of Idaho, U.S.

  

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

 

[Measure]  The volume (208.1976 l, liters) in a traditional standard drum of oil, (55 U.S. gallons).

 

209

[Math.]  209 = 16+25+34+43+52+61.

 

[Math.]  Five square numbers using the same digits: 1282 = 16,384, 1782 = 31,684, 1912 = 36,481, 1962 = 38,416 and 2092 = 43,681.

 

[Math.]  494+209 = 703 and 494,209 = 7032.

 

[Math.]  88+209 = 297 and 88,209 = 2972 and 494+209 = 703 and 494,209 = 7032 and 297+703 = 1000.

 

200-209

[Library]  Numbers 200-299 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Religion and Theology. Numbers 200-209 are for general & dictionary works.

 

200-299

[Education]  The numbers commonly assigned for graduate courses in most U.S. 

universities and colleges.

 

[Geology]  The number of islands of Hong Kong: 200+.