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  2. Narcissistic number - Wikipedia

    en.wikipedia.org/wiki/Narcissistic_number

    In number theory, a narcissistic number [1] [2] (also known as a pluperfect digital invariant (PPDI), [3] an Armstrong number [4] (after Michael F. Armstrong) [5] or a plus perfect number) [6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.

  3. List of recreational number theory topics - Wikipedia

    en.wikipedia.org/wiki/List_of_recreational...

    This is a list of recreational number theory topics (see number theory, recreational mathematics). Listing here is not pejorative : many famous topics in number theory have origins in challenging problems posed purely for their own sake.

  4. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    Fourth grade (also 4th Grade or Grade 4) is the fourth year of formal or compulsory education. It is the fourth year of primary school . Children in fourth grade are usually 9–10 years old.

  5. Armstrong number - Wikipedia

    en.wikipedia.org/?title=Armstrong_number&redirect=no

    From a synonym: This is a redirect from a semantic synonym of the target page title.. For example: automobile car This template should not be used to tag redirects that are taxonomic synonyms.

  6. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Sunday ...

    www.aol.com/today-nyt-strands-hints-spangram...

    For every 3 non-theme words you find, you earn a hint. Hints show the letters of a theme word. If there is already an active hint on the board, a hint will show that word’s letter order.

  7. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

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