250

[Game]  The minimum cash value on the “Wheel of Fortune” is currently (U.S.) $300.  The top values if currently $2,500 for round 1, $3,500 for rounds 2 and 3 and $5,000 for round 4 until the end of the game. The highest cash value in the special prize is $10,000. A player needs $250 in cash during the current round to buy a vowel. In the Bonus round, the minimum cash prize is currently $25,000 and the maximum is $100,000.

 

[Math.]  13+33+33 = 55, 53+53 = 250 and 23+53+03 = 133. 

 

[Math.]  Three square numbers using the same digits: 1602 = 25600, 2452 = 60025 and 2502 = 62500.

 

[Phone]  International telephone dialing code for Rwanda.

 

[Sport]  The maximum speed of a golf ball (250 feet/second+2%) when tested on USGA apparatus.

 

[Tech.]  Zip disks have memory capacity of 100MB, 250MB or 750MB (mega bytes) and unto 1GB or 2GB (gigabytes).

 

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

 

[Tech.]  Ford F-series pickups: F-100, F-150, F-250 and F-350…

 

251

[Math.]  A prime number.

 

[Math.]  Its odd powers end with 251. Its even powers end with 001.

 

[Math.]  The smallest 6th power that can be expressed as the sum of eight 6th powers, (Lander, Parkin & Selfridge): 2516 = 2466+1656+1386+1026+786+306+126+86.

 

[Math.]  The smallest case of 4 consecutive prime numbers in an arithmetic progression (of common difference 6): 251, 257, 263 and 269. The next case is 1741.

 

[Phone]  International telephone dialing code for Ethiopia.

 

252

[Math.]  252 = 12+23+35.

 

[Math.]  63504 = 441×144 = 2522.

 

[Math.] 

 12×21 = 252 = 21×12             

12×42 = 504 = 21×24          24×21 =    504 = 42×12

12×63 = 756 = 21×36          24×63 = 1,512 = 42×36    

12×84 = 1,008 = 21×48       24×42 = 1,008 = 42×24

36×84 = 3,024 = 63×48       24×84 = 2,016 = 42×48

 

[Money]  In the pre-decimalization British money system, a guinea is equal to 21 shillings (1 pound and 1 shilling), i.e., 252 pennies (or pence).

 

[Phone]  International telephone dialing code for Somalia (also in Somaliland).

 

[Science]  1 Btu (British thermal unit, European Union’s definition) = 252 calories = 778.17 ft×lb = 1055.056 J (joules) = 3412 Kwh (Kilowatt-Hour). Btu, the amount of heat required for raising the temperature of 1 lb of water by 1 oF (Fahrenheit) is 1,054.80 J (joules), in the U.S. Thermodynamically, 1 Btu = 1054.35 J = 3414 Kwh.

 

[Sport]  The number of dimples on a golf ball usually are: 252, 286, 332, 336, 360, 384, 392, 410, 416, 420, 422, 432, 440, 480, 492 or 500. (References [6])

 

253

[Math.]  A triangular number (sum of all integers from 1 to 22): 253 = 1+2+…+21+22.

 

[Phone]  International telephone dialing code for Djibouti.

 

[Sport]  One of soccer’s possible lineup tactics formations: 2-5-3 (2 defenders, 5 midfielders and 3 forwards). A slightly modified forwards line makes: 2-2-5-2-1 (1 striker).

 

254

[Gov.]  The number of counties in the state of Texas, the most among U.S. states. The second most is of Georgia: 159. The least is 3, the number of counties in the state of Delaware (Kent, New Castle and Sussex). Alaska does not divided into counties. Louisiana is divided into 64 parishes.

 

[Phone] International telephone dialing code for Kenya.

 

[Tech.] The shorter side (mm, millimeters) of the U.S. standard paper size “Executive” (10 in´7.5 in, 254 mm×190 mm).

 

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

 

255

[Math.] A regular polygon with this odd number (product of Fermat prime numbers) of sides is constructible by using only straightedge and compass. 255 = 3×5×17.

 

[Phone]  International telephone dialing code for Tanzania.

 

[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).

 

256 (separate page)

 

257

[Math.]  One of only 3 prime numbers of the form nn+1 (Sierpinski numbers of first kind): 2 = 11+1, 5 = 22+1 and 257 = 44+1.

 

[Math.]  The 4th Fermat number is a prime number. A regular 257-side polygon is constructible by using only straightedge and compass.

 

[Phone]  International telephone dialing code for Burundi.

 

[Phone]  International telephone dialing code for Mozambique.

 

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

 

259

[Measure]  The number of hectares in a square mile.

U.S. customary units for area measures: 1 acre = 160 square rods = 4,840 square yards = 43,560 square feet = 6,272,640 square inches = 4046.8564224 m2 & 1 square mile (1 section) = 640 acres = 2,589,988.11 m2 = 2.59 km2 = 259 hectares & 1 hectare = 2.471 acres = 10,000 m2 & 1 township = 36 square miles.

 

250-259

[Library]  Numbers 200-299 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Religion and Theology. Numbers 250-259 are for books in Religious Orders and Local Church.

 

200-299 

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

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References [6]: Scientific American, I. Stewart, Mathematical Recreations, February 1997.