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<DIV>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.</DIV>
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<DIV>Franklin T. Adams-Watters<BR> <BR>-----Original Message-----<BR>From: Ed Pegg Jr <A href="mailto:edp@wolfram.com">edp@wolfram.com</A><BR>
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<DIV class=AOLPlainTextBody id=AOLMsgPart_0_4bbdf3bf-149d-4a14-a74f-2343f856f3d3>I was looking at the known cyclic difference sets at <BR><A href="http://www.ccrwest.org/diffsets/diff_sets/baumert.html" target=_blank>http://www.ccrwest.org/diffsets/diff_sets/baumert.html</A> <BR> <BR>and started looking at the values where lambda = 1. For a long ways, <BR>it's identical to <BR> <BR><A href="http://www.research.att.com/~njas/sequences/A063977" target=_blank>http://www.research.att.com/~njas/sequences/A063977</A> <BR> <BR>It stops at 36 ... but they actually don't seem to have anything <BR>listed about (36, 1). <BR> <BR>Are these two sequences actually the same? If a number is in A063977, does <BR>that mean a difference set exists? <BR> <BR>Ed Pegg Jr <BR></DIV><!-- end of AOLMsgPart_0_4bbdf3bf-149d-4a14-a74f-2343f856f3d3 --></DIV></DIV>
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