Prime Curios!: 137

137
(another Prime Pages' Curiosity)

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Mabkhout (1993) showed that every number x^4 + 1, for x > 3, has a prime factor greater than or equal to 137. He used a classical result of Størmer. [Post]

Submitted: 2005-02-20 15:46:30; Last Modified: 2009-02-26 09:42:39.