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  2. Borwein's algorithm - Wikipedia

    en.wikipedia.org/wiki/Borwein's_algorithm

    Start by setting [4] = = = + Then iterate + = + + = (+) + + = (+ +) + + + Then p k converges quadratically to π; that is, each iteration approximately doubles the number of correct digits.The algorithm is not self-correcting; each iteration must be performed with the desired number of correct digits for π 's final result.

  3. Leibniz formula for π - Wikipedia

    en.wikipedia.org/wiki/Leibniz_formula_for_π

    The formula is a special case of the Euler–Boole summation formula for alternating series, providing yet another example of a convergence acceleration technique that can be applied to the Leibniz series. In 1992, Jonathan Borwein and Mark Limber used the first thousand Euler numbers to calculate π to 5,263 decimal places with the Leibniz ...

  4. Madhava series - Wikipedia

    en.wikipedia.org/wiki/Madhava_series

    The specific value ⁡ = can be used to calculate the circle constant π, and the arctangent series for 1 is conventionally called Leibniz's series. In recognition of Madhava's priority , in recent literature these series are sometimes called the Madhava–Newton series , [ 4 ] Madhava–Gregory series , [ 5 ] or Madhava–Leibniz series [ 6 ...

  5. Arctangent series - Wikipedia

    en.wikipedia.org/wiki/Arctangent_series

    In recent literature the arctangent series is sometimes called the Mādhava–Gregory series to recognize Mādhava's priority (see also Mādhava series). [ 3 ] The special case of the arctangent of ⁠ 1 {\displaystyle 1} ⁠ is traditionally called the Leibniz formula for π , or recently sometimes the Mādhava–Leibniz formula :

  6. Category:Pi algorithms - Wikipedia

    en.wikipedia.org/wiki/Category:Pi_algorithms

    This category presents articles pertaining to the calculation of Pi to arbitrary precision. Pages in category "Pi algorithms" The following 17 pages are in this category, out of 17 total.

  7. Sigma approximation - Wikipedia

    en.wikipedia.org/wiki/Sigma_approximation

    An m-1-term, σ-approximated summation for a series of period T can be written as follows: = + = (⁡) [⁡ + ⁡ ()], in terms of the normalized sinc function: ⁡ = ⁡. and are the typical Fourier Series coefficients, and p, a non negative parameter, determines the amount of smoothening applied, where higher values of p further reduce the ...

  8. Ramanujan–Sato series - Wikipedia

    en.wikipedia.org/wiki/Ramanujan–Sato_series

    The first expansion is the McKay–Thompson series of class 1A (OEIS: A007240) with a(0) = 744. Note that, as first noticed by J. McKay , the coefficient of the linear term of j ( τ ) almost equals 196883, which is the degree of the smallest nontrivial irreducible representation of the monster group , a relationship called monstrous moonshine .

  9. Pi function - Wikipedia

    en.wikipedia.org/wiki/Pi_function

    (Pi function) – the gamma function when offset to coincide with the factorial; Rectangular function – the Pisano period; You might also be looking for: = – the Infinite product of a sequence; Capital pi notation