A063977 and difference sets

[franktaw at netscape.net]

36 is the first element of A063977 that is not of the form p^k + 1, p a prime.  That is more likely the property you are looking for.
 
Franklin T. Adams-Watters
 
-----Original Message-----
From: Ed Pegg Jr edp at wolfram.com

I was looking at the known cyclic difference sets at 
http://www.ccrwest.org/diffsets/diff_sets/baumert.html 
 
and started looking at the values where lambda = 1. For a long ways, 
it's identical to 
 
http://www.research.att.com/~njas/sequences/A063977 
 
It stops at 36 ... but they actually don't seem to have anything 
listed about (36, 1). 
 
Are these two sequences actually the same? If a number is in A063977, does 
that mean a difference set exists? 
 
Ed Pegg Jr 
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