Magic star

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An n-pointed magic star is a star polygon with Schläfli symbol {n/2}<ref>{{#invoke:Template wrapper|{{#if:|list|wrap}}|_template=cite web |_exclude=urlname, _debug, id |url = https://mathworld.wolfram.com/{{#if:StarPolygon%7CStarPolygon.html}} |title = Star Polygon |author = Weisstein, Eric W. |website = MathWorld |access-date = |ref = Template:SfnRef }}</ref> in which numbers are placed at each of the n vertices and n intersections, such that the four numbers on each line sum to the same magic constant.<ref>Template:Cite book</ref> A normal magic star contains the integers from 1 to 2n with no numbers repeated.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The magic constant of an n-pointed normal magic star is M = 4n + 2.

No star polygons with fewer than 5 points exist, and the construction of a normal 5-pointed magic star turns out to be impossible. It can be proven that there exists no 4-pointed star that will satisfy the conditions here. The smallest examples of normal magic stars are therefore 6-pointed. Some examples are given below. Notice that for specific values of n, the n-pointed magic stars are also known as magic hexagrams (n = 6), magic heptagrams (n = 7), etc.

File:Magic6star-sum26.svg File:Magic7star-sum30.svg File:Magic8star-sum34.svg
Magic hexagram
M = 26
Magic heptagram
M = 30
Magic octagram
M = 34

The number of distinct normal magic stars of type {n/2} for n up to 15 is,

0, 80, 72, 112, 3014, 10882, 53528, 396930, 2434692, 15278390, 120425006, ... (sequence A200720 in the OEIS).

See alsoEdit

ReferencesEdit

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External linksEdit

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