primes of the form 2^n+5

[Jim Nastos]

On Tue, 8 Oct 2002, Christian G. Bower wrote:

> Hans Havermann <hahaj at rogers.com> wrote:
> > > These are the values of n such that 2^n+5 is prime (up to 3000):
> > > 1, 3, 5, 11, 47, 53, 141, 143, 191, 273, 341
> > 
> > I believe the next n is 16541.
> > 
> 
> How are 1 and 3 primes of the form 2^n+5?

  Hans isn't saying that. 1 and 3 are the values of n for which
2^n + 5 is prime.
  2^1+5 = 7.
  2^3+5 = 13.

> Is 1 + (pi/ln(2))i one of the allowed values of n?

  We're probably restricting ourselves to *integer* sequences...

-- 
Jim Nastos, B.Math, B.Ed          |     Office: 117 Athabasca Hall
MSc Candidate                     |     Office Phone: (780) 492-5046
University Of Alberta             |     Edmonton, Alberta
Department of Computing Science   |     T6G 2H1
nastos at cs.ualberta.ca             |
http://www.cs.ualberta.ca/people/grad/nastos.html