No subject
Mohammed BOUAYOUN
Mohammed.BOUAYOUN at sanef.com
Tue Mar 9 14:21:59 CET 2004
Dear SeqFan,
Let a(n) = n!.2^n +1
a(n) is prime for n=1 and n=259 but there are no other prime for n<2650
Can any one extend this sequence ?
I remark that if p is prime then p divide a(p-1)
we can prove this by wilson's theorem and Fermat's Little Theorem
if p is prime and gcd(q,p)=1 then p divide (p-1)!.q^(p-1) + 1
Thanks
M.Bouayoun
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.seqfan.eu/pipermail/seqfan/attachments/20040309/de39da35/attachment.htm>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: InterScan_Disclaimer.txt
URL: <http://list.seqfan.eu/pipermail/seqfan/attachments/20040309/de39da35/attachment.txt>
More information about the SeqFan
mailing list