[seqfan] Re: New seq A284172 from David Sycamore looks interesting
BenoĆ®t Jubin
benoit.jubin at gmail.com
Thu Mar 23 18:08:28 CET 2017
If I'm not mistaken, one has for n > 6,
a(2n+1) = 2n+3 if (n+2 is prime or n+1 is a P-prime), and 2 else,
a(2n) = 3n+2 if n+1 is a P-prime, and n+2 else,
where I defined a P-prime as a prime p such that 2p-1 is prime (there
is probably a standard term for that property).
Benoit
On Tue, Mar 21, 2017 at 9:59 PM, Neil Sloane <njasloane at gmail.com> wrote:
> (end of message)
>
> --
> Seqfan Mailing list - http://list.seqfan.eu/
More information about the SeqFan
mailing list