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A165916
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Irregular triangle read by rows: squarefree quadratic non-residues.
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3
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2, 2, 3, 2, 3, 2, 5, 3, 5, 6, 2, 3, 5, 6, 7, 2, 3, 5, 6, 2, 3, 7, 2, 6, 7, 10, 2, 3, 5, 6, 7, 10, 11, 2, 5, 6, 7, 11, 3, 5, 6, 10, 13, 2, 3, 5, 7, 11, 13, 14, 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 3, 5, 6, 7, 10, 11, 14, 2, 3, 5, 6, 11, 14, 15, 17, 2, 3, 10, 13, 14, 15
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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COMMENTS
| The irregular triangle of numbers is:
..n....Squarefree quadratic non-residues
..1....
..2....
..3....2
..4....2..3
..5....2..3
..6....2..5
..7....3..5..6
..8....2..3..5..6..7
..9....2..3..5..6
.10....2..3..7
.11....2..6..7.10
.12....2..3..5..6..7.10.11
.13....2..5..6..7.11
.14....3..5..6.10.13
.15....2..3..5..7.11.13.14
.16....2..3..5..6..7.10.11.13.14.15
.17....3..5..6..7.10.11.14
.18....2..3..5..6.11.14.15.17
.19....2..3.10.13.14.15
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LINKS
| C. H. Gribble, Flattened irregular triangle read by rows j = 3 to 200
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MATHEMATICA
| Flatten[Table[Select[Complement[Range[n - 1], Mod[Range[n/2]^2, n]], SquareFreeQ], {n, 3, 30}]] (* T. D. Noe, Nov 22 2011 *)
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CROSSREFS
| Cf. A096013.
Sequence in context: A060324 A046216 A105560 * A096013 A072380 A144910
Adjacent sequences: A165913 A165914 A165915 * A165917 A165918 A165919
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KEYWORD
| nonn,tabf
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AUTHOR
| Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Sep 30 2009
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EXTENSIONS
| Minor edit by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 05 2009
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