[seqfan] Re: Questionable use of the term "mode" in A096693 and A082077.

Christopher Gribble chris.eveswell at virgin.net
Tue Apr 6 18:05:01 CEST 2010

Hi Franklin,

Thanks for your feedback.  I will submit a change request accordingly.
The second comment is misleading.  It concerns sum (j=1..n, a(j)) / n.
I have written a PARI program to calculate it.  Sure enough, the global
0.588 occurs at prime = 439.  I will also submit a b-file.

Best regards,


-----Original Message-----
From: seqfan-bounces at list.seqfan.eu [mailto:seqfan-bounces at list.seqfan.eu]
On Behalf Of franktaw at netscape.net
Sent: 04 April 2010 9:17 PM
To: seqfan at list.seqfan.eu
Subject: [seqfan] Re: Questionable use of the term "mode" in A096693 and

Actually, looking at the example section of A096693, the correct word 
in this case is "mean". In fact, the whole clause "at the center (mode) 
of" is nonsensical and should be removed.

Yes, 5 is the third prime, not the fifth.

I don't understand the second comment in A096693. At first I thought it 
was a claim that a(n) has a maximum value of a(85) = 50; but a(85) = 2 
is in the entry.  Perhaps it is talking about the number of primes 
being averaged? If so, it is almost certainly wrong.

Franklin T. Adams-Watters

-----Original Message-----
From: Christopher Gribble <chris.eveswell at virgin.net>


In the COMMENT section of A096693 and the EXAMPLE section of A082077, 
term "mode" is used to refer to the center value in a numerically 
subsequence of primes.  I believe the term should be "median".

In addition,  in the EXAMPLE section of A096693, 5 is clearly the 3rd 
and not the 5th as stated.  Do you agree?

Best regards,



Seqfan Mailing list - http://list.seqfan.eu/

More information about the SeqFan mailing list