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  2. Keith number - Wikipedia

    en.wikipedia.org/wiki/Keith_number

    Keith number. In recreational mathematics, a Keith number or repfigit number (short for rep etitive F ibonacci-like d igit) is a natural number in a given number base with digits such that when a sequence is created such that the first terms are the digits of and each subsequent term is the sum of the previous terms, is part of the sequence.

  3. Truncatable prime - Wikipedia

    en.wikipedia.org/wiki/Truncatable_prime

    Truncatable prime. In number theory, a left-truncatable prime is a prime number which, in a given base, contains no 0, and if the leading ("left") digit is successively removed, then all resulting numbers are prime. For example, 9137, since 9137, 137, 37 and 7 are all prime. Decimal representation is often assumed and always used in this article.

  4. Repdigit - Wikipedia

    en.wikipedia.org/wiki/Repdigit

    Repdigit. In recreational mathematics, a repdigit or sometimes monodigit [1] is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal ). The word is a portmanteau of "repeated" and "digit". Examples are 11, 666, 4444, and 999999. All repdigits are palindromic numbers and are ...

  5. Federal Information Processing Standard state code - Wikipedia

    en.wikipedia.org/wiki/Federal_Information...

    FIPS state codes were numeric and two-letter alphabetic codes defined in U.S. Federal Information Processing Standard Publication ("FIPS PUB") 5-2 to identify U.S. states and certain other associated areas. The standard superseded FIPS PUB 5-1 on May 28, 1987, and was superseded on September 2, 2008, by ANSI standard INCITS 38:2009.

  6. How to Do a Free Reverse Phone Lookup & the 8 Best ... - AOL

    www.aol.com/finance/free-reverse-phone-lookup-8...

    5. GreatPeopleSearch. GreatPeopleSearch is a user-friendly free reverse phone number lookup site that provides searchers with fast and accurate results. It draws on publicly available national ...

  7. Perfect digit-to-digit invariant - Wikipedia

    en.wikipedia.org/wiki/Perfect_digit-to-digit...

    In number theory, a perfect digit-to-digit invariant ( PDDI; also known as a Munchausen number [1]) is a natural number in a given number base that is equal to the sum of its digits each raised to the power of itself. An example in base 10 is 3435, because . The term "Munchausen number" was coined by Dutch mathematician and software engineer ...

  8. Centered polygonal number - Wikipedia

    en.wikipedia.org/wiki/Centered_polygonal_number

    Centered polygonal number. The centered polygonal numbers are a class of series of figurate numbers, each formed by a central dot, surrounded by polygonal layers of dots with a constant number of sides. Each side of a polygonal layer contains one more dot than each side in the previous layer; so starting from the second polygonal layer, each ...

  9. Google announces new scam detection tools that provide real ...

    www.engadget.com/google-announces-new-scam...

    Tue, May 14, 2024 · 1 min read. Google. Google just announced forthcoming scam detection tools coming to Android phones later this year, which is a good thing as these scammers keep getting ...

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