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A165925 Irregular triangle read by rows: square-full quadratic non-residues.

%I A165925 #9 Aug 03 2014 14:01:25
%S A165925 8,8,8,8,8,12,8,12,8,12,12,8,12,8,12,18,8,12,18,8,12,20,8,18,20,8,18,
%T A165925 20,8,12,18,20,8,18,20,24,8,12,18,20,24,12,18,20,24,27,8,12,18,27,8,
%U A165925 12,18,20,27,28,12,24,27,8,12,18,20,24,27,28,8,18,20,24,28,32,12,20,24,27,28
%N A165925 Irregular triangle read by rows: square-full quadratic non-residues.
%C A165925 The irregular triangle of numbers is:
%C A165925 ..n....Square-full quadratic non-residues
%C A165925 ..1....
%C A165925 ..2....
%C A165925 ..3....
%C A165925 ..4....
%C A165925 ..5....
%C A165925 ..6....
%C A165925 ..7....
%C A165925 ..8....
%C A165925 ..9.....8
%C A165925 .10.....8
%C A165925 .11.....8
%C A165925 .12.....8
%C A165925 .13.....8
%C A165925 .14....12
%C A165925 .15.....8.12
%C A165925 .16.....8.12
%C A165925 .17....12
%C A165925 .18.....8.12
%C A165925 .19.....8.12.18
%C A165925 .20.....8.12.18
%C A165925 .21.....8.12.20
%C A165925 .22.....8.18
%C A165925 .23....20
%C A165925 .24.....8.18.20
%C A165925 .25.....8.12.18.20
%C A165925 .26.....8.18.20.24
%C A165925 .27.....8.12.18.20.24
%C A165925 .28....12.18.20.24.27
%C A165925 .29.....8.12.18.27
%C A165925 .30.....8.12.18.20.27.28
%C A165925 .31....12.24.27
%C A165925 .32.....8.12.18.20.24.27.28
%C A165925 .33.....8.18.20.24.28.32
%C A165925 .34....12.20.24.27.28
%H A165925 C. H. Gribble, <a href="/A165925/b165925.txt">Flattened irregular triangle read by rows j = 9 to 200</a>
%t A165925 Flatten[Table[Select[Complement[Range[n - 1], Mod[Range[n/2]^2, n]], ! SquareFreeQ[#] &], {n, 9, 34}]] (* _T. D. Noe_, Nov 22 2011 *)
%Y A165925 Cf. A096013.
%K A165925 nonn,tabf
%O A165925 9,1
%A A165925 _Christopher Hunt Gribble_, Sep 30 2009