OFFSET
9,1
COMMENTS
The irregular triangle of numbers is:
..n....Square-full quadratic non-residues
..1....
..2....
..3....
..4....
..5....
..6....
..7....
..8....
..9.....8
.10.....8
.11.....8
.12.....8
.13.....8
.14....12
.15.....8.12
.16.....8.12
.17....12
.18.....8.12
.19.....8.12.18
.20.....8.12.18
.21.....8.12.20
.22.....8.18
.23....20
.24.....8.18.20
.25.....8.12.18.20
.26.....8.18.20.24
.27.....8.12.18.20.24
.28....12.18.20.24.27
.29.....8.12.18.27
.30.....8.12.18.20.27.28
.31....12.24.27
.32.....8.12.18.20.24.27.28
.33.....8.18.20.24.28.32
.34....12.20.24.27.28
LINKS
C. H. Gribble, Flattened irregular triangle read by rows j = 9 to 200
MATHEMATICA
Flatten[Table[Select[Complement[Range[n - 1], Mod[Range[n/2]^2, n]], ! SquareFreeQ[#] &], {n, 9, 34}]] (* T. D. Noe, Nov 22 2011 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Christopher Hunt Gribble, Sep 30 2009
STATUS
approved