[seqfan] Re: Balanced Sophie Germain primes of zero order.

[Zak Seidov]

Yes, you are right:
for some crazy reason I excluded 5 as summand :(


>Понедельник, 19 сентября 2016, 16:31 +03:00 от Emmanuel Vantieghem <emmanuelvantieghem at gmail.com>:
>
>I think the SG primes  23, 28, 89  and  743  should not appear in the list.
>Indeed :
>23 = (5  + 41)/2
>29 = (5  + 53)/2
>89 = (5  + 173)/2
>743 = (5  + 1481)/2.
>But there are no further SG primes < 1700000000  that are balanced SG
>primes of zero order.
>
>2016-09-18 8:42 GMT+02:00 Zak Seidov via SeqFan < seqfan at list.seqfan.eu >:
>
>>  Sophie Germain primes which are not the average of any pair of other SG
>> primes.
>>
>> 2, 3, 5, 11, 23, 29, 89, 179, 239, 293, 359, 683, 743, 5639
>>
>> May be coined as  "Balanced SG primes of zero order".
>> Is the sequence finite and full?
>> What about SG primes which are not the average of three (or more) SG
>> primes?
>> Cf. A005384 Sophie Germain primes.
>>
>> --
>> Zak  Seidov
>>
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>> Seqfan Mailing list -  http://list.seqfan.eu/
>>
>
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