Numbers 770-779

A page of the Numeropedia - the Special Encyclopedia of Numbers

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770

[Tech.]  The “number system” code of an EAN-13 barcode for Colombia’s products.

[Tech.]  The Dual Tone Multi-Frequency (DTMF) Keypad

 Frequency 1209 Hz 1336 Hz 1477 Hz 1633 Hz 697 Hz 1 2 3 A 770 Hz 4 5 6 B 852 Hz 7 8 9 C 941 Hz * 0 # D

771

[Math.]  A regular polygon with this odd number (product of Fermat prime numbers) of sides is constructible by using only straightedge and compass. 771 = 3´257.

772

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

773

[Math.]  A prime number.

[Tech.]  The “number system” code of an EAN-13 barcode for Uruguay’s products.

774

775

[Tech.]  The “number system” code of an EAN-13 barcode for Peru’s products: 775 and 785.

776

[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.

[Sport]  The Olympic Games (Olympiad) were started in the year 776 B.C.

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

777

[Math.]  Surrounding the number 777 with number 11 forms some prime numbers: 11777, 77711, 11777711 and 11117771111.

[Phone]  The emergency telephone number dialing within Kuwait.

[Phone]  The number to key in text messaging on telephone keypad for letter Q.

[Tech.]  The “number system” code of an EAN-13 barcode for Bolivia’s products.

[Tech.]  Boeing 777 airplane (242 feet 4 inches long and 199 feet 11 inches wide), a member in the family of passenger airplane/jetliner models “7n7”: 707, 717, 727, 737, 747, 757, 767, 777, 7E7 and 787. It was designed in 1989. Its capacity is up to 368 passengers, cruising speed is 623 mph and non-stop flight distance is 6,853 miles.

Boeing 7E7 airplane (“E” is efficiency literally) was designed in 2003. Its capacity is up to 250 passengers, cruising speed is 627 mph and non-stop flight distance is 7,595 miles.

778

[Math.]  Numbers of the same pattern, xxy, where y = x +1:

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: 3342 = 111556 & 111+556 = 667.

778.17

[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.

779

[Tech.]  The “number system” code of an EAN-13 barcode for Argentina’s products.

770-779

[Library]  Numbers 700-799 are the first 3 digits in Dewey Decimal Classification System call numbers for books in Fine Arts (Painting, Music, Sport and Photography...).  Numbers 770-779 are for books in Photography.