[seqfan] Re: A268539: Primes in
Zak Seidov
zakseidov at mail.ru
Sat Mar 5 22:53:15 CET 2016
Also, A(n)=A(n-4)+24, see Comments by M. F. Hasler in A268539.
Zak
>Среда, 2 марта 2016, 21:21 -06:00 от "Bob Selcoe" <rselcoe at entouchonline.net>:
>
>Hi Robert, Zak and Seqfans,
>
>>>>Each term of A268539 is of the form (x^2-25)/48 = (x-5)(x+5)/48
>
>Unless I'm mistaken, the values of x in Robert's equation are sequence A(x)
>starting a(1)=5 with periodic first differences of [6,2,6,10], so A(x) =
>5,11,13,19,29,35,37,43,53,59,61,67,77,83,85...
>
>Might make for an interesting entry??
>
>Cheers,
>Bob Selcoe
>
>--------------------------------------------------
>From: < israel at math.ubc.ca >
>Sent: Wednesday, March 02, 2016 7:56 PM
>To: "Sequence Fanatics Discussion list" < seqfan at list.seqfan.eu >
>Subject: [seqfan] Re: A268539: Primes in
>
>> 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
>>
>> --
>> Seqfan Mailing list - http://list.seqfan.eu/
>>
>
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>Seqfan Mailing list - http://list.seqfan.eu/
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