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  2. Six nines in pi - Wikipedia

    en.wikipedia.org/wiki/Six_nines_in_pi

    A sequence of six consecutive nines occurs in the decimal representation of the number pi (π), starting at the 762nd decimal place. [1] [2] It has become famous because of the mathematical coincidence, and because of the idea that one could memorize the digits of π up to that point, and then suggest that π is rational.

  3. Prime-counting function - Wikipedia

    en.wikipedia.org/wiki/Prime-counting_function

    In the On-Line Encyclopedia of Integer Sequences, the π(x) column is sequence OEIS: A006880, π(x) − ⁠ x / log x ⁠ is sequence OEIS: A057835, and li(x) − π(x) is sequence OEIS: A057752. The value for π (10 24 ) was originally computed by J. Buethe, J. Franke , A. Jost, and T. Kleinjung assuming the Riemann hypothesis . [ 13 ]

  4. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  5. Piphilology - Wikipedia

    en.wikipedia.org/wiki/Piphilology

    The word is a play on the word "pi" itself and of the linguistic field of philology. There are many ways to memorize π, including the use of piems (a portmanteau, formed by combining pi and poem), which are poems that represent π in a way such that the length of each word (in letters) represents a digit. [1]

  6. Pion - Wikipedia

    en.wikipedia.org/wiki/Pion

    ɒ n /, PIE-on) or pi meson, denoted with the Greek letter pi (π), is any of three subatomic particles: π 0, π +, and π −. Each pion consists of a quark and an antiquark and is therefore a meson. Pions are the lightest mesons and, more generally, the lightest hadrons. They are unstable, with the charged pions π + and π −

  7. Character interval - Wikipedia

    en.wikipedia.org/wiki/Character_interval

    An example of a time interval that is excluded when determining character interval is any time added between the end of a stop signal and the beginning of the next start signal to accommodate changing transmission conditions, such as a change in data signaling rate or buffering requirements.

  8. Pisano period - Wikipedia

    en.wikipedia.org/wiki/Pisano_period

    If k 2 + 4 is a quadratic residue modulo p (where p > 2 and p does not divide k 2 + 4), then +, /, and / + can be expressed as integers modulo p, and thus Binet's formula can be expressed over integers modulo p, and thus the Pisano period divides the totient =, since any power (such as ) has period dividing (), as this is the order of the group ...

  9. Periodic function - Wikipedia

    en.wikipedia.org/wiki/Periodic_function

    A function with period P will repeat on intervals of length P, and these intervals are sometimes also referred to as periods of the function. Geometrically, a periodic function can be defined as a function whose graph exhibits translational symmetry , i.e. a function f is periodic with period P if the graph of f is invariant under translation ...