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Description
English: The first 100,000 elements of the sequence (red line), where is the prime-counting function. Adrien-Marie Legendre conjectured in 1808 that this sequence would converge to a value of approximately 1.08366 (blue line), which became known as Legendre's constant. The actual limit was later shown to be exactly 1.
Français : En rouge, les 100 000 premiers termes de la suite , où est la fonction de compte des nombres premiers. Adrien-Marie Legendre a conjecturé en 1808 que cette suite converge vers un nombre valant approximativement 1,08366 (en bleu), qui est devenu la Constante de Legendre. Il a été prouvé plus tard que la limite exacte est 1.
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Plotted in Maple and converted to SVG format in Inkscape by Ilmari Karonen, using the following Maple code by Sandrobt: 

with(numtheory):
with(plots):
a:=vector(100000-1,i->[i+1,evalf(log(i+1)-(i+1)/pi(i+1))]):
b:=vector(100000-1,i->[i,1.08366]):
display(plot(b, color = blue,thickness=3),plot(a, color = red), view=[1..100000,0.8..1.2]);
Author Sandrobt and Ilmari Karonen
Other versions
File:Legendre constant.png
File:Legendre's constant 10 000 000.svg
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15 June 2010

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Date/TimeThumbnailDimensionsUserComment
current20:08, 15 June 2010Thumbnail for version as of 20:08, 15 June 2010694 × 336 (742 KB)Ilmari Karonen{{Information |Description={{en|1=The first 10,000 elements of the sequence <math>a_n = \ln(n) - \frac{n}{\pi(n)}</math> (red line), where <math>\pi</math> is the prime-counting function. [[:en:Adrien-Marie Legendre|Adrien

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