File:Aliquot sums and untouchable numbers.pdf

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Aliquot_sums_and_untouchable_numbers.pdf (file size: 7 KB, MIME type: application/pdf)

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Summary

Description
English: Diagram showing the map from positive integers to their aliquot sums (sum of all proper divisors), highlighting the "untouchable numbers" 2 and 5 that are not in the image. Source code:
\documentclass{standalone}
\usepackage{graphicx} % for \scalebox
\usepackage{tikz}
\usetikzlibrary{arrows.meta} % for more arrow tip styles

\begin{document}

\scalebox{2.0}{ % scale factor for Mediawiki rasterization
\begin{tikzpicture}[>={Stealth}, every node/.style={circle, draw, minimum size=0.5cm}, yscale=-1]

% Nodes on the left
\node (L1) at (0,1) {1};
\node (L2) at (0,2) {2};
\node (L3) at (0,3) {3};
\node (L4) at (0,4) {4};
\node (L5) at (0,5) {5};
\node (L6) at (0,6) {6};
\node (L7) at (0,7) {7};
\node (L8) at (0,8) {8};
\node (L9) at (0,9) {9};
\node (L10) at (0,10) {10};
% Ellipsis
\node[draw=none] at (0,11) {\vdots};

% Nodes on the right
\node[fill=green!40] (R0) at (2,0) {0};
\node[fill=green!40] (R1) at (2,1) {1};
\node[fill=  red!40] (R2) at (2,2) {2};
\node[fill=green!40] (R3) at (2,3) {3};
\node[fill=green!40] (R4) at (2,4) {4};
\node[fill=  red!40] (R5) at (2,5) {5};
\node[fill=green!40] (R6) at (2,6) {6};
\node[fill=green!40] (R7) at (2,7) {7};
\node[fill=green!40] (R8) at (2,8) {8};
% Ellipsis
\node[draw=none] at (2,9) {\vdots};

% Edges
\begin{scope}
    \draw[>->] (L1) -- (R0);
    \draw[>->] (L2) -- (R1);
    \draw[>->] (L3) -- (R1);
    \draw[>->] (L4) -- (R3);
    \draw[>->] (L5) -- (R1);
    \draw[>->] (L6) -- (R6);
    \draw[>->] (L7) -- (R1);
    \draw[>->] (L8) -- (R7);
    \draw[>->] (L9) -- (R4);
    \draw[>->] (L10) -- (R8);
\end{scope}

\end{tikzpicture}
} % end of \scalebox

\end{document}
Date
Source Own work
Author Shreevatsa

Licensing

Shreevatsa, the copyright holder of this work, hereby publishes it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
Attribution:
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.


This image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.
It is recommended to name the SVG file “Aliquot sums and untouchable numbers.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.

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26 August 2023

application/pdf

8847bc3f18b9d2705a2976d2a42f261e312a20b8

7,230 byte

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360 pixel

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Date/TimeDimensionsUserComment
current04:40, 27 August 2023 (7 KB)wikimediacommons>ShreevatsaUsed scalebox to correct for poor rasterization

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