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1/2 + 1/4 + 1/8 + 1/16 + ⋯. First six summands drawn as portions of a square. The geometric series on the real line. In mathematics, the infinite series 1 2 + 1 4 + 1 8 + 1 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation ...
Some sequences have alternate names: 4n+1 are Pythagorean primes, 4n+3 are the integer Gaussian primes, and 6n+5 are the Eisenstein primes (with 2 omitted). The classes 10 n + d ( d = 1, 3, 7, 9) are primes ending in the decimal digit d .
The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...
16 is the ninth composite number, and a square number: 4 2 = 4 × 4 (the first non-unitary fourth-power prime of the form p4 ). It is the smallest number with exactly five divisors, its proper divisors being 1, 2, 4 and 8 . Sixteen is the only integer that equals mn and nm, for some unequal integers m and n ( , , or vice versa). [ 1]
f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...
The Bell Model 67 design was designated the X-16. A full-scale mock-up was completed and one aircraft was partially completed. It was designed as a high altitude long-range reconnaissance aircraft. The X-16 design was breaking new ground with its design. Its wing was long 114 ft 10 in (35.00 m) with a high (11.9) aspect ratio. The structure was ...
Zone 8 uses four 2-digit codes (81, 82, 84, 86) and four sets of 3-digit codes (80x, 85x, 87x, 88x) to serve East Asia, South Asia and special services. 83x and 89x are unallocated. Zone 9 uses seven 2-digit codes (90–95, 98) and three sets of 3-digit codes (96x, 97x, 99x) to serve the Middle East , West Asia , Central Asia , parts of South ...
Almost all the sci-fi spaceships you know are on this massive chart. jon fingas. Reporter. Updated Mon, Sep 22, 2014 · 1 min read. If you regularly follow geek culture, you've probably seen early ...