==== Primtal ====

  * [[primtal faktorer|Finde alle faktorer]]
  * [[OEIS_med_primtal|OEIS, der genererer primtal]]
  * [[http://arxiv.org/abs/0710.3217|A natural prime-generating recurrence]]
  * [[http://arxiv.org/abs/0911.3491|Generalizations of the Rowland theorem]]
  * [[http://factordb.com/|Factor DB]]
  * [[http://maths.nju.edu.cn/~zwsun/|Zhi-Wei Sun]]
  * [[https://en.wikibooks.org/wiki/Algorithm_Implementation/Mathematics/Primality_Testing|Primality Testing code]]
  * [[youtube>v=HPfAnX5blO0|Glitch Primes and Cyclops Numbers]]