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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 ...
Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
[1] [6] [7] Psychologist Julie Schwartz Gottman has cast doubt on the concept of a "primary" love language and the usefulness of insisting on showing or receiving love in only one way. [8] A 2006 confirmatory factor analysis study by Nicole Egbert and Denise Polk suggests that the five love languages may have some degree of psychometric validity.
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 ...
1,1,1,3,3,3-Hexafluoropropane is a greenhouse gas; its global warming potential is 9810. [2] [3] [4] It is manufactured by reacting 1,1,1,3,3,3-hexachloropropane with hydrogen fluoride in gas phase at temperature between 250-400 °C, in presence of a catalyst in the form of trivalent chromium (e.g. chromium (III) chloride) supported on carbon ...
This is a list of emoticons or textual portrayals of a writer's moods or facial expressions in the form of icons. Originally, these icons consisted of ASCII art, and later, Shift JIS art and Unicode art. In recent times, graphical icons, both static and animated, have joined the traditional text-based emoticons; these are commonly known as ...
3 p − 1 ≡ 1 (mod p 2): 11, 1006003 (OEIS: A014127) [17] [18] [19] 4 p − 1 ≡ 1 (mod p 2): 1093, 3511 5 p − 1 ≡ 1 (mod p 2): 2, 20771, 40487, 53471161, 1645333507, 6692367337, 188748146801 (OEIS: A123692) 6 p − 1 ≡ 1 (mod p 2): 66161, 534851, 3152573 (OEIS: A212583) 7 p − 1 ≡ 1 (mod p 2): 5, 491531 (OEIS: A123693) 8 p − 1 ...