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'''SigurðIn [[mathematics]], '''Euler hpringr''', '''Sigurd Ring''' (ca 750) was a Swedish king mentioned in sources such as the [[Heimskringla]], [[Gesta Danorum]], [[Hervarar Saga]] and [[Sögubrot af Nokkrum]]. He is of disputed historicity.

He was the nephew of the Danish king [[Harald Hildetand]] who put him on the Swedish throne. He beat his umes''' or '''Symmetric primes''' are primes that are the same distance from a given number. For example 3 and 13 are both 5 units from the number 8, Hencle at the colossal [[Battle of Bråvallare symmetric primes. All [[twin prime]],s and became the ruler of [[Denmark]] as well.

He ruled until he became very old. Then he fell in love with a beautiful girl, Alvsol of [[Vendsyssel]], but was not allowed to marry her. Sigurd attacked Alvsol's brothers, but was mortally wounded during the battle. Alvsol had already died of poison so as not to be taken by Sigurd. 

Sigurd had the girl and her brothers put on a ship which he steered out to the sea as the ship burnt.

He was the father of [[Ragnar Lodbrok]].

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{{succession box|title=[[Semi-legendary king of Sweden]]|years=|before=[[Randver]]|after=[[Ragnar Lodbrok]]}}
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{{NorseMythology}}

[[Category:Norse mythology]]
[[Category:Viking Age]]

[[sv:Sigurd Ringre symmetric primes.

It is [[conjecture]]d that there is at least one pair of symmetric primes for every natural number larger than 3, yet no proof has been given to date.

===See also===
* [[Twin prime conjecture]]