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  2. HackThisSite - Wikipedia

    en.wikipedia.org/wiki/HackThisSite

    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.

  3. Look-and-say sequence - Wikipedia

    en.wikipedia.org/wiki/Look-and-say_sequence

    In this case, the term following 21 would be 1112 ("one 1, one 2") and the term following 3112 would be 211213 ("two 1s, one 2 and one 3"). This variation ultimately ends up repeating the number 21322314 ("two 1s, three 2s, two 3s and one 4"). These sequences differ in several notable ways from the look-and-say sequence.

  4. 1 + 2 + 3 + 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    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 ]

  5. Mystery Case Files: Return to Ravenhearst Walkthrough Part 3

    www.aol.com/news/2013-02-12-mystery-case-files...

    Back to Part 1 > Back to Part 2 > DOOR KNOB USAGE-Gingerbread House Click on the back door of the bedroom in the Gingerbread House and you will see a closer view of the door. Take the door knob ...

  6. Lucas number - Wikipedia

    en.wikipedia.org/wiki/Lucas_number

    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, ... .

  7. Three prisoners problem - Wikipedia

    en.wikipedia.org/wiki/Three_Prisoners_problem

    As the warden says B will be executed, it is either because C will be pardoned (⁠ 1 / 3 ⁠ chance), or A will be pardoned (⁠ 1 / 3 ⁠ chance) and the coin to decide whether to name B or C the warden flipped came up B (⁠ 1 / 2 ⁠ chance; for an overall ⁠ 1 / 2 ⁠ × ⁠ 1 / 3 ⁠ = ⁠ 1 / 6 ⁠ chance B was named because A will be ...

  8. Tutorial - Wikipedia

    en.wikipedia.org/wiki/Tutorial

    Another example is Imperial College London, where tutorials in groups of 3 take place. [2] It is rare for newer universities in the UK to have the resources to offer individual tuition; a class of six to eight students is a far more common tutorial size. At Cambridge, a tutorial is known as a supervision.

  9. 1,3,5-Trimethyl-1,3,5-triazinane - Wikipedia

    en.wikipedia.org/wiki/1,3,5-Trimethyl-1,3,5-tri...

    1,3,5-Trimethyl-1,3,5-triazinane is an organic compound with the formula (CH 3 NCH 2) 3. It is a colorless liquid that is soluble in many organic solvents. Structurally, it is one of several related hexahydro-1,3,5-triazines, which typically result from the condensation reaction of amines and formaldehyde.