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 A166715 Irregular triangle read by rows: row n lists nonzero quadratic residues modulo the n-th term of A123239. 2
 1, 1, 1, 3, 4, 5, 9, 1, 3, 4, 9, 10, 12, 1, 3, 4, 7, 9, 10, 11, 12, 16, 21, 25, 26, 27, 28, 30, 33, 34, 36, 1, 2, 4, 5, 8, 9, 10, 16, 18, 20, 21, 23, 25, 31, 32, 33, 36, 37, 39, 40, 1, 3, 4, 5, 7, 9, 12, 15, 16, 17, 19, 20, 21, 22, 25, 26, 27 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 Eric Weisstein's World of Mathematics, Quadratic Residue. EXAMPLE Triangle starts: 1; 1; 1,3,4,5,9; 1,3,4,9,10,12; ... Modulo A123239(3)=11, the quadratic residues are 1,3,4,5,9. MATHEMATICA MangammalQ[p_]:=Block[{k=3}, While[k>2, k=Mod[3k, p]]; k!=2]; A123239=Select[Prime[Range[17]], MangammalQ]; A166715=Flatten[Union[Mod[Range[Floor[#/2]]^2, #]]&/@A123239] (* Ray Chandler, Jul 21 2011 *) CROSSREFS Cf. A046071, A063987, A123239. Sequence in context: A010375 A095028 A011246 * A330577 A020863 A215496 Adjacent sequences:  A166712 A166713 A166714 * A166716 A166717 A166718 KEYWORD nonn,tabf AUTHOR A.K. Devaraj, Oct 20 2009 EXTENSIONS Edited by N. J. A. Sloane, Oct 22 2009 Edited by Charles R Greathouse IV, Oct 28 2009 Edited, corrected and extended by Ray Chandler, Jul 21 2011 STATUS approved

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Last modified August 17 00:01 EDT 2022. Contains 356180 sequences. (Running on oeis4.)