[seqfan] Re: A268539: Primes in

israel at math.ubc.ca israel at math.ubc.ca
Thu Mar 3 02:56:50 CET 2016


On Mar 2 2016, Zak Seidov wrote:

> https://oeis.org/A268539  
>
>Are 2,3,7,17 the only primes in A268539?
>
>--
>Seqfan Mailing list - http://list.seqfan.eu/
>

Yes.  Each term of A268539 is of the form (x^2-25)/48 = (x-5)(x+5)/48 where 
x is an integer.  So if x > 53, it must factor...

Cheers,
Robert


More information about the SeqFan mailing list