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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. Angstrom - Wikipedia

    en.wikipedia.org/wiki/Angstrom

    The atomic (covalent) radii of phosphorus, sulfur, and chlorine are about 1 angstrom, while that of hydrogen is about 0.5 angstroms. Visible light has wavelengths in the range of 4000–7000 Å. In the late 19th century, spectroscopists adopted 10 −10 of a metre as a convenient unit to express the wavelengths of characteristic spectral lines ...

  4. 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.

  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. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Palindromic number - Wikipedia

    en.wikipedia.org/wiki/Palindromic_number

    A number that is non-palindromic in all bases b in the range 2 ≤ b ≤ n − 2 can be called a strictly non-palindromic number. For example, the number 6 is written as "110" in base 2, "20" in base 3, and "12" in base 4, none of which are palindromes. All strictly non-palindromic numbers larger than 6 are prime.

  9. 313 (number) - Wikipedia

    en.wikipedia.org/wiki/313_(number)

    a full reptend prime [2] (and the smallest number which is a full reptend prime in base 666 but not in base 222 to 0) a Pythagorean prime [3] a regular prime [4] a palindromic prime in both decimal and binary. a truncatable prime [5] a weakly prime in base 6; a happy number [6] an Armstrong number - in base 000 3.00 ( 3×4 2 + 1×4 1 + 3×4 0 ...