Numbers 190-199

A page of the Numeropedia - the Special Encyclopedia of Numbers

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190

[Math.]  A triangular number (sum of all integers from 1 to 19): 190 = 1+2+…+18+19.

[Phone]  The emergency telephone number dialing within Brazil (and being switched to 911).

[Phone]  The emergency telephone number dialing within Tunisia.

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

[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

[Measure]  The length of a standard pencil, including the tip eraser: 190.5 millimeters

191

[Geology]  The Kansas state rout 191 ends near a marker, designating the town Lebanon as the geographic center of the 48 contiguous states of the U.S.: 39o50’ North latitude and 98o35’ West longitude. It is 1424 miles from New York City and 1450 miles from Los Angeles). The geographic center of the U.S. is designated 20.8 miles north of Belle Fourche, South Dakota.

[Geology]  Switzerland, joining the United Nations on 10 September 2002, as its 191st member.

[Geology]  The number of nations/members of the United Nations as of 2005.

The number of nations that were invited to attend the 2004 Olympics Games (Athens, Greece) is 201.

[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.]  The smallest Sophie Germaine prime number, which is palindromic. Both 191 and twice of it plus 1 (383) are palindromic prime numbers.

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

191 & 193

[Math.]  A palindromic prime number. The only 5-digit palindromic number, which is the product of twin prime numbers is 36863 = 191×193.

191 & 199

[Phone]  The emergency telephone numbers dialing within Thailand are 191 & 199.

192

[Math.]  Sum 192+384 = 576 is one of only 4 cases that the equality: n+2n = 3n use each of 9 digits 1-9 once: n = 192, 219, 273 and 327.

[Tech.]  The AES (Advanced Encryption Standard) algorithm uses 128, 192- and 256-bit keys to encrypt/decrypt 128-bit plaintext/ciphertext in banking funds transfer security, replacing the DES (Data Encryption Algorithm), after the year 2000.

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

192 & 193

[Phone]  The emergency telephone numbers dialing within Jordan are 192 and 193.

193

[Math.]  6313+4613+1933 = 356,400,829 = 7093. The smallest prime whose cube is sum of 3 different cubes of prime numbers.

[World]  The number of independent countries/states as of 2003: 191 members of the United Nations and 2 non-members: Taiwan and The Holy See/Vatican City.

194

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

[Math.]  A base system of multigrade equalities.

1+6+6+11 = 24 = 2+3+9+10

12+62+62+112 = 194 = 22+32+92+102 and

13+63+63+113 = 1764 = 23+33+93+103. (References [??])

Multigrade equalities still hold by adding any integer n to every base term in both sides.  Hence, the base equality always has number 1 appearing in one side.

195

[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).

196

[Math.]  It is conjectured that 196 is the smallest Lychrel number.

[Math.]  Squares of 2 consecutive numbers that use the same digits: 132 = 169 and 142 = 196. Others: 1572 & 1582 and 9132 & 9142.

[Math.]  Three square numbers using the same digits: 132 = 169, 142 = 196 and 312 = 961.

[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.]  162,409 = 169×961 = 4032 = 13×13×31×31.

[Math.]  Squares and cubes of 2 numbers using the same digits: 1782 = 31,684 and 1962 = 38,416 & 1783 = 5,639,752 and 1963 = 7,529,536.

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

197

[Math.]  The only 3-digit prime number whose digits are (circularly) consecutive odd digits. (Also its rotations of digits: 971 and 719).

[Math.]  Circular prime numbers: all 3 numbers 197, 971 and 719 are prime.

[Math.]  The only prime number that is the sum of 12 consecutive prime numbers: 197 = 2+3+5+7+11+13+17+19+23+29+31+37.

[Math.]  Sum of squares of the first 4 composite numbers: 197 = 42+62+82+92.

[Math.]  The 7th Keith number: 1, 9, 7, 17, 33, 57, 107, 197, 361…

198

[Math.]  198 = 11+99+88.

[Math.]  0198×45 = 8910.

[Math.]  18×297 = 5,346 = 27×198. Each equality uses each of 9 digits 1-9 once.

[Measure]  The number of inches in a rod.

U.S. customary units for linear measures: 1 mile = 8 furlongs = 320 rods = 1,760 yards = 5,280 feet = 63,360 inches.

199

[Math.]  An absolute prime number (or permutable prime number): all 3 numbers 199, 991 and 919 are prime or in fact, absolute prime.

[Math.]  Circular prime numbers: all 3 numbers 199, 991 and 919 are prime.

[Math.]  The 11th Lucas number.

[Phone]  The emergency telephone number dialing within Malawi, Cyprus and Nigeria.

190-199

[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 190-199 are for books in Modern Western 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.