[seqfan] Re: First term correct in A055832?

Christopher Gribble chris.eveswell at virgin.net
Fri Apr 2 20:14:50 CEST 2010

Hi Tony,
Silly me!  Muddled thinking on my part!  However, given your reasoning, why
aren't the primes 2 and 3 for n = 1?

-----Original Message-----
From: seqfan-bounces at list.seqfan.eu [mailto:seqfan-bounces at list.seqfan.eu]
On Behalf Of T. D. Noe
Sent: 02 April 2010 7:22 AM
To: Sequence Fanatics Discussion list
Subject: [seqfan] Re: First term correct in A055832?

At 6:51 PM +0100 4/1/10, Christopher Gribble wrote:
>A055832 is defined as "A sequence of 2n primes with symmetrical gaps about
>the center starts at this prime.", yet the first term is 3, relating to
>5 - 3 = 2 and 7 - 5 = 2, so there is no "center" .  Shouldn't the first
>of A055832 be 5?
>If it was then A175309(2n+1) would = A055832(n) for all n>=1.

The sequence is A055382.  The 2 primes are 3 and 5, making just 1 gap.
Seems fine to me.  I suggest changing the name to say "2n consecutive



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