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  2. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ... Composite number : A positive integer that can be factored into a product of smaller positive integers. Every integer greater than one is either prime or composite.

  3. 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]

  4. Ternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Ternary_numeral_system

    0 01: 1 02: 2 10: 3 11: 4 12: 5 20: 6 21: 7 22: 8 ... each out is considered one third of a defensive inning and is denoted as .1. For example, ...

  5. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]

  6. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, ... "subtract if possible, otherwise add" : a (0) = 0; for n > 0, a ( n ) = a ( n − 1) − n if that number is positive and not already in the sequence, otherwise a ( n ) = a ( n − 1) + n , whether or not that number is already in the sequence.

  7. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    For example, in the decimal system (base 10), the numeral 4327 means (4×10 3) + (3×10 2) + (2×10 1) + (7×10 0), noting that 10 0 = 1. In general, if b is the base, one writes a number in the numeral system of base b by expressing it in the form a n b n + a n − 1 b n − 1 + a n − 2 b n − 2 + ... + a 0 b 0 and writing the enumerated ...

  8. Numerical digit - Wikipedia

    en.wikipedia.org/wiki/Numerical_digit

    the 3 is to the right of the ones place, so it is in the tenths place, and is called the tenths digit; [10] the 4 to the right of the tenths place is in the hundredths place, and is called the hundredths digit. [10] The total value of the number is 1 ten, 0 ones, 3 tenths, and 4 hundredths.

  9. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    The typical range lies between 1 ⁄ 2 to 2 ⁄ 3 inch (12.7 to 16.9 mm) for the UK/US size system and 43 to 53 cm (13.3 to 16.7 mm) for the European size system, but may extend to 1 ⁄ 4 to 34 inch (6.4 to 19.1 mm) and 2 ⁄ 3 to 63 cm (6.7 to 20.0 mm).