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Old 2007-01-10, 19:13   #5
fatphil's Avatar
May 2003

23110 Posts

Originally Posted by Xentar View Post
eh.. is it the same with
18 * 18^n+1 ?
and if not, could you please try to explain it to me? (Yea, I'm trying to learn the math behind these projects )
They are also just 18^n+1. Again, they can only be prime if n is a power of 2, and would be Generalised Fermat Numbers. Have a look at Yves Gallot's GFN page for more info.
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