Search results
Results from the WOW.Com Content Network
The organization has a user base of over a million, [2] though the number of active members is believed to be much lower. The most users online at the same time was 19,950 on February 5, 2018 at 2:46 a.m. CT. [2] HackThisSite involves a small, loose team of developers and moderators who maintain its website, IRC server, and related projects.
where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = 1 / 6 , B 4 = − + 1 / 30 , and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]
The sequence also has a variety of relationships with the Fibonacci numbers, like the fact that adding any two Fibonacci numbers two terms apart in the Fibonacci sequence results in the Lucas number in between. [3] The first few Lucas numbers are 2, 1, 3, 4, 7, 11, 18, 29, 47, 76, 123, 199, 322, 521, 843, 1364, 2207, 3571, 5778, 9349, ... .
21 is read off as "one 2, one 1" or 1211. 1211 is read off as "one 1, one 2, two 1s" or 111221. 111221 is read off as "three 1s, two 2s, one 1" or 312211. The look-and-say sequence was analyzed by John Conway [1] after he was introduced to it by one of his students at a party. [2] [3]
In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. [1] For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.
With the growth in popularity of video gaming in the early 1980s, a new genre of video game guide book emerged that anticipated walkthroughs. Written by and for gamers, books such as The Winners' Book of Video Games (1982) [1] and How To Beat the Video Games (1982) [2] focused on revealing underlying gameplay patterns and translating that knowledge into mastering games. [3]
The walkthrough method does not test real users on the system. The walkthrough will often identify many more problems than you would find with a single, unique user in a single test session; There are social constraints that inhibit the cognitive walkthrough process. These include time pressure, lengthy design discussions and design defensiveness.
The final digit of a triangular number is 0, 1, 3, 5, 6, or 8, and thus such numbers never end in 2, 4, 7, or 9. A final 3 must be preceded by a 0 or 5; a final 8 must be preceded by a 2 or 7. In base 10, the digital root of a nonzero triangular number is always 1, 3, 6, or 9. Hence, every triangular number is either divisible by three or has a ...