Numbers 230-239

A page of the Numeropedia - the Special Encyclopedia of Numbers

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230

[Biology]  The number of joints in a human body. (to be checked).

[Phone]  International telephone dialing code for Mauritius.

231

[Math.]  A triangular number (sum of all integers from 1 to 21):  231 = 1+2+…+20+21.

[Measure]  U.S. customary units for liquid measures: 1 gallon = 4 quarts = 8 pints = 32 gills = 128 fluid ounces = 1024 fluid drams = 61440 minims = 3.785411784 liters = 231 inch3.

[Phone]  International telephone dialing code for Liberia.

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

232

[Sport]  Playoff series “best of seven” is usually in 2-3-2 format for Final series, where seven games are played in alternating courts, starting with the home court of the team of better record, except in the non-Final series, it is 2-2-1-1-1.

[Math.]  (232+767 = 999 = 212+787)

2322 = 053,824 & 053+824 = 877

7672 = 588,289 & 588+289 = 877

and

2122 = 044,944 & 044+944 = 988

7872 = 619,369 & 619+369 = 988.

[Math.]  e^(p´2321/2) = 604,729,957,825,300,084,759.99999217152 is a transcendental number (i.e., not a root of any polynomial equation with integer coefficients)very close to the integer 604,729,957,825,300,084,760.

[Phone]  International telephone dialing code for Sierra Leone.

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

233

[Math.]  A right-truncatable prime number: self, 23 and 2 are prime numbers.

[Math.]  The 13th Fibonacci number. The largest known prime Fibonacci number whose subscript is also a prime Fibonacci number.

[Math.]  The first Markov numbers are 1, 2, 5, 13, 29, 34, 89, 169, 194, 233...

[Phone]  International telephone dialing code for Ghana.

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

234

[Math.]  234 = 21+42+63.

[Phone]  International telephone dialing code for Nigeria.

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

235

[Calendar]  On average, 19 solar years (228 solar months) is almost exactly 235 lunar months, approximately: 19´365.2422 = 6939.6018 and 235´29.53 = 6939.55, (but also was given 6939.6884). It is called Metonic cycle, when all the phases of waxing and waning moon fall on the same days of the weeks for the whole solar year.

[Math.]  2352 = 55,225 = (5+5+225)2.

[Phone]  International telephone dialing code for Chad.

[Sport]  One of soccer’s possible lineup tactics formations: (Pyramid) 2-3-5 (2 defenders, 3 midfielders and 5 forwards). A slightly modified forwards line makes: 2-3-4-1 (1 striker) or 2-3-3-2 (2 strikers).

[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).

236

[Phone]  International telephone dialing code for Central African Republic.

236.588

[Measure]  1 cup = 236.588 ml (milliliters).

U.S. customary units for kitchen measurements: ½ pints = 1 cup = 8 fluid ounces = 16 tablespoons = 48 teaspoons = 2880 drops = 236.588 ml.

237

[Phone]  International telephone dialing code for Cameroon.

238

[Phone]  International telephone dialing code for Cape Verde.

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

239

[Math.]  A right-truncatable prime number: self, 23 and 2 are prime numbers.

[Math.]  1,111,111 = 239×4649.

[Math.]  A well-know, even complicated,  formula:

arctan(1/239) = 4×arctan(1/5)–p/4 = arctan(1/70)–arctan(1/99) =

= arctan(1/408)+arctan(1/577).

[Math.]  Every integer can be a sum of at most 8 cube numbers, except number 23 and 239, which requires 9 cube numbers. The number 239 is also the sum 19 fourth powers.

[Phone]  International telephone dialing code for São Tomé and Príncipe.

[World]  The ISO country code for South Georgia and the South Sandwich Islands. (ISO-3166)

230-239

[Library]  Numbers 200-299 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Religion and Theology. Numbers 230-239 are for books in Christian Theology.

200-299

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