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  2. Heegner number - Wikipedia

    en.wikipedia.org/wiki/Heegner_number

    Ramanujan's constant is the transcendental number [5], which is an almost integer: [6] = … +. This number was discovered in 1859 by the mathematician Charles Hermite. [7] In a 1975 April Fool article in Scientific American magazine, [8] "Mathematical Games" columnist Martin Gardner made the hoax claim that the number was in fact an integer, and that the Indian mathematical genius Srinivasa ...

  3. Heegner - Wikipedia

    en.wikipedia.org/wiki/Heegner

    Heegner points are special points on elliptic curves The Stark–Heegner theorem identifies the imaginary quadratic fields of class number 1. A Heegner number is a number n such that Q ( √ − n ) is an imaginary quadratic field of class number 1.

  4. Stark–Heegner theorem - Wikipedia

    en.wikipedia.org/wiki/Stark–Heegner_theorem

    In number theory, the Heegner theorem [1] establishes the complete list of the quadratic imaginary number fields whose rings of integers are principal ideal domains. It solves a special case of Gauss's class number problem of determining the number of imaginary quadratic fields that have a given fixed class number .

  5. Gelfond's constant - Wikipedia

    en.wikipedia.org/wiki/Gelfond's_constant

    The number e π √ 163 is known as Ramanujan's constant. Its decimal expansion is given by: e π √ 163 = 262 537 412 640 768 743.999 999 999 999 250 072 59... (sequence A060295 in the OEIS) which suprisingly turns out to be very close to the integer 640320 3 + 744: This is an application of Heegner numbers, where 163 is the

  6. Kurt Heegner - Wikipedia

    en.wikipedia.org/wiki/Kurt_Heegner

    Kurt Heegner (German: [ˈheːɡnɐ]; 16 December 1893 – 2 February 1965) was a German private scholar from Berlin, who specialized in radio engineering and mathematics. He is famous for his mathematical discoveries in number theory and, in particular, the Stark–Heegner theorem .

  7. Almost integer - Wikipedia

    en.wikipedia.org/wiki/Almost_integer

    Ed Pegg Jr. noted that the length d equals (), which is very close to 7 (7.0000000857 ca.) [1] In recreational mathematics, an almost integer (or near-integer) is any number that is not an integer but is very close to one.

  8. Formula for primes - Wikipedia

    en.wikipedia.org/wiki/Formula_for_primes

    The phenomenon is related to the Ulam spiral, which is also implicitly quadratic, and the class number; this polynomial is related to the Heegner number =. There are analogous polynomials for p = 2 , 3 , 5 , 11 and 17 {\displaystyle p=2,3,5,11{\text{ and }}17} (the lucky numbers of Euler ), corresponding to other Heegner numbers.

  9. Heegner point - Wikipedia

    en.wikipedia.org/wiki/Heegner_point

    In mathematics, a Heegner point is a point on a modular curve that is the image of a quadratic imaginary point of the upper half-plane. They were defined by Bryan Birch and named after Kurt Heegner , who used similar ideas to prove Gauss's conjecture on imaginary quadratic fields of class number one.