OFFSET
3,1
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
LINKS
C. H. Gribble, Flattened irregular triangle read by rows j = 3 to 200
MATHEMATICA
Flatten[Table[Select[Complement[Range[n - 1], Mod[Range[n/2]^2, n]], SquareFreeQ], {n, 3, 30}]] (* T. D. Noe, Nov 22 2011 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Christopher Hunt Gribble, Sep 30 2009
EXTENSIONS
Minor edit by Christopher Hunt Gribble, Oct 05 2009
STATUS
approved