natural numbers 1 + 2 + 3 + 4 + ⋯ is a divergent series. The nth partial sum of the series is the triangular number ∑ k = 1 n k = n ( n + 1 ) 2 , {\displaystyle...

partial sums of 1 − 2 + 3 − 4 + ... are: 1, 1 − 2 = −1, 1 − 2 + 3 = 2, 1 − 2 + 3 − 4 = −2, 1 − 2 + 3 − 4 + 5 = 3, 1 − 2 + 3 − 4 + 5 − 6 = −3, ... The sequence...

4.3.2.1. (which stands for "4 girls, 3 days, 2 cities, 1 chance") is a 2010 British crime thriller film written, produced and directed by Noel Clarke,...

4, 3, 2, 1 or 4321 may refer to: 4.3.2.1., 2010 film by Noel Clarke ...4 ..3 ..2 ..1 ...Morte, a 1967 Italian science fiction film "4, 3, 2, 1" (k-os song)...

is 4–2–1–3, where the midfielders are split into two defensive and one offensive player; as such, this formation can be considered a type of 4–3–3. An...

Lotus 1-2-3 is a discontinued spreadsheet program from Lotus Software (later part of IBM). It was the first killer application of the IBM PC, was hugely...

4 3 2 1 is a novel by Paul Auster published in January 2017. At the time of its publication, it was the first new Auster novel to have appeared in seven...

OpenOffice 4, LibreOffice 4.1 is released". ghacks.net. Archived from the original on 14 February 2014. Retrieved 4 March 2014. "Release Notes 3.4". The Document...

3-2-1 Contact is an American science educational television show produced by the Children's Television Workshop (CTW, now known as Sesame Workshop). It...

3-2-1 Penguins! is an American science fiction computer-animated Christian children's television series, initially launched on November 14, 2000 as a...