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Werkenntwen (English: "Whoknowswhom"), often abbreviated in German as wkw, was a German social networking site. TechCrunch once compared it to Myspace. [2] According to Alexa Internet in July 2011, werkenntwen's traffic was ranked 959 worldwide [3] and was one of the most successful websites in Germany. [4]
0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, ... "subtract if possible, otherwise add" : a (0) = 0; for n > 0, a ( n ) = a ( n − 1) − n if that number is positive and not already in the sequence, otherwise a ( n ) = a ( n − 1) + n , whether or not that number is already in the sequence.
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In mathematics, a sequence of positive real numbers (,,...) is called superincreasing if every element of the sequence is greater than the sum of all previous elements in the sequence. [1] [2] Formally, this condition can be written as + > = for all n ≥ 1.
The first Hofstadter sequences were described by Douglas Richard Hofstadter in his book Gödel, Escher, Bach.In order of their presentation in chapter III on figures and background (Figure-Figure sequence) and chapter V on recursive structures and processes (remaining sequences), these sequences are:
Part 1: The Principles of Best Year Yet – three hours to change your life First published by HarperCollins in 1994 and by Warner Books in 1998 Available in 12 other languages, including Spanish, Dutch, German, Italian, Swedish, Romanian, Chinese, and Japanese Author Jinny S. Ditzler has retained the digital
The same stanzas (1, 2 and 7) are number 451 in the Swiss Katholisches Gesangbuch der deutschsprachigen Schweiz . In the Gotteslob of 2013, stanzas 1–3, 6 and 7 appear as GL 424. The tune of "Wer nur den lieben Gott" has also been used for a variety of other texts. [12]
In mathematics, a Somos sequence is a sequence of numbers defined by a certain recurrence relation, described below. They were discovered by mathematician Michael Somos . From the form of their defining recurrence (which involves division), one would expect the terms of the sequence to be fractions, but surprisingly, a few Somos sequences have ...