all-Harshad numbers. Each natural number divisible by 4 is a difference of squares of two natural numbers, i.e. 4 x = y 2 − z 2 {\displaystyle 4x=y^{2}-z^{2}} ...

the U.S. military would typically use spaces and a capital 'X' – as "4 X 2" or "6 X 4". Four-wheel drive (4WD) refers to vehicles with two axles providing...

Mac OS X Tiger (version 10.4) is the 5th major release of macOS, Apple's desktop and server operating system for Mac computers. Tiger was released to...

Ruhrstahl Ru 344 X-4 or Ruhrstahl-Kramer RK 344 was a wire-guided air-to-air missile designed by Germany during World War II. The X-4 did not see operational...

announced a GPT-4 powered assistant named "Copilot X". The product provides another chat-style interface to GPT-4, allowing the programmer to receive answers...

science fiction television series The X-Files commenced airing on the Fox network in the United States on October 4, 1996, concluding on the same channel...

X-4 Bantam Chuck Yeager Scott Crossfield John McKay Joseph Walker...

4x4 ("Four by four") refers to four-wheel drive. 4x4 or 4×4 may also refer to: 4x4 (1965 film), a Nordic film 4x4 (2019 film), an Argentine-Spanish film...

The Northrop X-4 Bantam is a prototype small twinjet aircraft manufactured by Northrop Corporation in 1948. It had no horizontal tail surfaces, depending...

Quartets 4 X 4 is a 1980 album by jazz pianist McCoy Tyner, released on the Milestone label. It was recorded in March and May 1980 by Tyner with bassist...

jestertoogmailcom (2018-04-12). "4.6mm x 30mm PDW". Military Cartridges. Retrieved 2023-03-30. RUAG Ammotec 2.0 g German Army 4.6×30mm Penetrator DM11 cartridge...

Despicable Me 4 is a 2024 American animated comedy film produced by Universal Pictures and Illumination, and distributed by Universal. It is the sequel...

Persona 4 Golden, was released for PlayStation Vita in 2012. It was later ported to Windows, Nintendo Switch, PlayStation 4, Xbox One, and Xbox Series X/S in...

4-6-4T locomotives, built in September 1914 by MLW and acquired for suburban service. Numbered 1540 to 1545 on the GTR, they were reclassified as X-10-a...

for PlayStation 4, PlayStation 5, Windows, Xbox One, and Xbox Series X/S. The game is considered to be a spiritual successor to the Left 4 Dead series, and...

notation for the classification of steam locomotives by wheel arrangement, 4-4-2 represents a configuration of a four-wheeled leading bogie, four powered...

Channel 4 is a British free-to-air public broadcast television channel owned and operated by Channel Four Television Corporation. It is publicly owned...

The BE-4 (Blue Engine 4) is an oxygen-rich liquefied-methane-fueled staged-combustion rocket engine produced by Blue Origin. The BE-4 was developed with...

year are still useful). Another disadvantage is that the 4–4–5 calendar has only 364 days (7 days x 52 weeks), meaning a 53rd week must be added every five...

The X Factor is a British television music competition to find new singing talent. The fourth series was broadcast on ITV from 18 August 2007 and was...

MPEG-4 Part 2 (including Advanced Simple Profile, used by codecs such as DivX, Xvid, Nero Digital, RealMedia, 3ivx, H.263 and by QuickTime 6) and MPEG-4 part...

enough to hold off the new 3 GHz Pentium 4 HT. The Pentium 4 HT's increase to a 200 MHz quad-pumped bus (200 x 4 = 800 MHz effective) greatly helped to...

(2012), Nexus 4, Nexus 10, Nexus 7 (2013), and Hyundai Play X. The first of these three releases, 4.1, was unveiled at Google's I/O developer conference in...

The IS-4, also known as the Object 701, was a Soviet heavy tank that started development in 1943 and began production in 1946. Derived from the IS-2 and...

The PlayStation 4 (PS4) is a home video game console developed by Sony Interactive Entertainment. Announced as the successor to the PlayStation 3 in February...

mass spectrometry and X-ray photoelectron spectroscopy have been demonstrated to discriminate finite differences in different C-4 sources. Chemical, morphological...

released on November 9, 2023, for Windows, PlayStation 5 and Xbox Series X/S, with a Nintendo Switch version to be released, at an unspecified later...

International Inc., 1997. ISBN 0-9653993-2-X. Proctor, Jon (2019). "TWA's Skyliners: The Martin 2-0-2 and 4-0-4 in TWA Service". The Aviation Historian (29):...

In American football, the 4–4 defense is a defensive alignment consisting of four down linemen and four linebackers. Originally seen as a passing defense...

superhero team the X-Men, the fifth mainline installment of the X-Men film series, a sequel to X-Men: The Last Stand (2006) and X-Men: First Class (2011)...