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  2. Serial sevens - Wikipedia

    en.wikipedia.org/wiki/Serial_sevens

    Each subtraction is considered as a unit and calculations are made on the basis of the 14 possible correct subtractions, that is 100-93-86-79-72-65-58-51-44-37-30-23-16-9-2. [ 2 ] Similar tests include serial threes where the counting downwards is done by threes, reciting the months of the year in reverse order, or spelling 'world' backwards.

  3. Page numbering - Wikipedia

    en.wikipedia.org/wiki/Page_numbering

    Page number in a book. Page numbering is the process of applying a sequence of numbers (or letters, or Roman numerals) to the pages of a book or other document. The number itself, which may appear in various places on the page, can be referred to as a page number or as a folio. [1]

  4. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system. They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded. However, because of the length of large numbers, tallies ...

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  6. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    These numbers are the lowest ones with the indicated step count, but not necessarily the only ones below the given limit. As an example, 9 780 657 631 has 1132 steps, as does 9 780 657 630 . The starting values having the smallest total stopping time with respect to their number of digits (in base 2) are the powers of two since 2 n is halved n ...

  7. College Football Playoff bracket projection boils down to ...

    www.aol.com/college-football-playoff-bracket...

    Behind 206 yards from running back Ashton Jeanty, the Broncos beat UNLV for the second time this year and secured an opening-round bye into the quarterfinals. Boise State has won 11 in a row since ...

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