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  2. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  3. Look-and-say sequence - Wikipedia

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

    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] The idea of the look-and-say sequence is similar to that of run-length encoding.

  4. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    A number that has the same number of digits as the number of digits in its prime factorization, including exponents but excluding exponents equal to 1. A046758 Extravagant numbers

  5. National Geographic Video - Wikipedia

    en.wikipedia.org/wiki/National_Geographic_Video

    Tracing Numbers Educational Video Presentations ... Numbers 1-100 Educational Video Presentations 51515 ... 30 0-7922-1776-4 ...

  6. 30 (number) - Wikipedia

    en.wikipedia.org/wiki/30_(number)

    It has an aliquot sum of 42; within an aliquot sequence of thirteen composite numbers (30, 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0) to the Prime in the 3-aliquot tree. From 1 to the number 30, this is the longest Aliquot Sequence. It is also: A semiperfect number, since adding some subsets of its divisors (e.g., 5, 10 and 15 ...

  7. What will happen to Social Security under Trump’s tax plan?

    www.aol.com/finance/happen-social-security-under...

    According to the Tax Foundation, Trump’s proposed tax cut would reduce tax revenue by about $1.4 trillion from 2025 to 2034, measured on a conventional basis.

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