[seqfan] Re: Essentially the same sequences, but newer one has more terms

Frank Adams-Watters franktaw at netscape.net
Wed Jul 8 05:01:28 CEST 2015


With sequences this old, there is absolutely no question of removing either sequence.

Neither sequence is incorrect.

So, do two things:

1) extend A005047 with values derived from A065825.

2) Add a cross-reference in each sequence to the other sequence. Include the formula below.

Franklin T. Adams-Watters

-----Original Message-----
From: Rob Pratt <Rob.Pratt at sas.com>
To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
Sent: Tue, Jul 7, 2015 8:20 pm
Subject: [seqfan] Essentially the same sequences, but newer one has more terms


A005047 Minimal span of set of n elements with no 3-term arithmetic progression.

A065825 Smallest k such that n numbers may be picked in {1,...,k} with no three
terms in arithmetic progression. 

A065825(n) = A005047(n) +
1

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