[seqfan] Re: a(n) = p(3n) - p(2n) - p(n)

[Jack Brennen]

I don't get those numbers.  For n=2, p(n)=3, isn't it:

    p(6)-p(4)-p(2) = 13-7-3 = 3, which is not a cube

I get this sequence:

    2, 31, 911, 929, 941, 997, 1013, 4273, 4289, 8171, 13171, 20233,
    20261, 57139, 123637, 229631, 278609, 278689, 328277, 526213,
    611213, 703267, 906229, 1287479, 1287623, 1290031, 1442549,
    1442723, 1443257, 1443311, 1443383, 1948343, 1948669, 2361899,
    3331093, 3331621, 3333283, 3333307, 3933337, 3935203, 6065281,
    6065687, 7410877, 9504023

On 7/18/2013 10:30 AM, юрий герасимов wrote:
>
> Hello, SegFans,
> Primes p(n) such that p(3n) - p(2n) - p(n) is a cube; 2, 3, 31, 2281,...
> What is the next one ?
>
> Best regards,
> JSG
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/
>
>