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  2. Unary numeral system - Wikipedia

    en.wikipedia.org/wiki/Unary_numeral_system

    The unary numeral system is the simplest numeral system to represent natural numbers: [1] to represent a number N, a symbol representing 1 is repeated N times. [2]In the unary system, the number 0 (zero) is represented by the empty string, that is, the absence of a symbol.

  3. Binary number - Wikipedia

    en.wikipedia.org/wiki/Binary_number

    For example, the binary number 100101 is converted to decimal form as follows: 100101 2 = [ ( 1) × 2 5] + [ ... The simplest arithmetic operation in binary is ...

  4. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    Two to the power of n, written as 2 n, is the number of values in which the bits in a binary word of length n can be set, where each bit is either of two values. A word, interpreted as representing an integer in a range starting at zero, referred to as an "unsigned integer", can represent values from 0 (000...000 2) to 2 n − 1 (111...111 2) inclusively.

  5. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The generator polynomial specified for the (26,19,2) code, is: = + + + + + + +, which may also be written in the form of a matrix of decimal coefficients: [1 127 122 154 164 11 68 117] The 17-byte long message "www.wikipedia.org" as hexadecimal coefficients (ASCII values), denoted by M1 through M17 is:

  6. Central processing unit - Wikipedia

    en.wikipedia.org/wiki/Central_processing_unit

    Nearly all modern CPUs represent numbers in binary form, with each digit being represented by some two-valued physical quantity such as a "high" or "low" voltage. [g] A six-bit word containing the binary encoded representation of decimal value 40. Most modern CPUs employ word sizes that are a power of two, for example 8, 16, 32 or 64 bits.

  7. Economy of China - Wikipedia

    en.wikipedia.org/wiki/Economy_of_China

    The economy of the People's Republic of China is a developing mixed socialist market economy, incorporating industrial policies and strategic five-year plans. [29] China is the world's second largest economy by nominal GDP and since 2017 has been the world's largest economy when measured by purchasing power parity (PPP).

  8. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    In the widely accepted ΛCDM cosmological model, dark matter accounts for about 25.8% ± 1.1% of the mass and energy in the universe while about 69.2% ± 1.2% is dark energy, a mysterious form of energy responsible for the acceleration of the expansion of the universe. [17] Ordinary ('baryonic') matter therefore composes only 4.84% ± 0.1% of ...

  9. 72 (number) - Wikipedia

    en.wikipedia.org/wiki/72_(number)

    72 is the magic constant of the first non-normal, full prime reciprocal magic square in decimal, based on ⁠ 1 / 17 ⁠ in a 16 × 16 grid. [17] [18] 72 is the sum between 60 and 12, the former being the second unitary perfect number before 6 (and the latter the smallest of only two sublime numbers).