Numbers 12,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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12,000

[EECS]  12K(W) is one of standard numerical values for resistors (of tolerance class 5%).

[Geology]  Minnesota is known as “Land of 10,000 Lakes”, but it actually has more than 12,000 lakes.

[Math.]  Squares and cubes of 2 numbers using the same digits: 1012 = 10201 and 1102 = 12100 & 1013 = 1,030,301 and 1103 = 1,331,000.

12,100

[Math.]  Square of numbers of similar pattern xxy, where y = x–1.

* 1102 = 012,100 & 012+100 = 112 = 110+2.

* 3322 = 110,224 & 110+224 = 334 = 332+2.

Similarly, 3…322 = 1…102…24 & 1…10+2…24 = 3…34 = 3…32+2.

* 4432 = 196,249 & 196+249 = 445 = 443+2

* 6652 = 442,225 & 442+225 = 667 = 665+2.

Similarly, 6…652 = 4…422…25 & 4…42+2…25 = 6…67 = 6…65+2.

* 7762 = 602,176 & 602+176 = 778 = 776+2.

12,221

[Math.]  A prime number.

22223 = 10,970,645,048 = (109+7064+5048)3.

55553 = 171,416,328,875 = (1714+1632+8875)3.

88883 = 702,121,283,072 = (7021+2128+3072)3.

12,285

[Math.] A pair of all-odd amicable numbers (12285, 14595).

12,300--12,399

12,404

[Geology]  The length (feet or 2 miles 1844 feet) of the Albert D. Rosellini Bridge at Evergreen Point, (Seattle, Washington, U.S.) the world’s longest floating bridge connecting Seattle and Medina across the Lake Washington.

12,496

[Math.]  The first known sociable number chain (by Poulet, 1918):

12496 → 14288 → 15472 → 14536 → 14264 → 12496.

12,543

[Math.]  125432 = 157,326,849, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

12,544

[Math.]  1122 = 012,544 & 012+544 = 556 ® 5562 = 309,136 & 309+136 = 445 ® 4452 = 198,025 & 198+025 = 223 ® 2232 = 049,729 & 049+729 = 778 ® 7782 = 605,284 & 605+284 = 889 ® 8892 = 790,321 & 790+321 = 1111. Also in the same pattern: 3342 = 111556 & 111+556 = 667.

[Math.]  Three square numbers using the same digits: 1122 = 12544, 2112 = 44521 and 2292 = 52441.

12,582

[Math.]  125822 = 158,306,724, one of 22 squares using all 9 digits 0-8 once.

12,586

[Math.]  125862 = 158,407,396, a square using all 9 digits 0-9 once, except digit 2.

12,600

[Math.]  Sum (in degrees) of all internal angles of a 72-side polygon.

12,769

[Math.]  Reversible numbers and their squares: 12,769 = 1132 and 3112 = 96,721.

12,859

[Math.]  Two multiples of number 1837, 1837×2 = 3674 and 1837×7 = 12,859, use each of 9 digits 1-9 once.

12,972

[Math.]  Two consecutive sums of consecutive numbers:

529+530+…+552 = 553+554+…+575 = 12,972.

12,996

[Math.]  12,996 = (12996)2 = 1142.

12nnn

[Zip]  U.S. Postal Zip Codes of New York: 10nnn-14nnn and 005nn.