OFFSET
1,1
COMMENTS
See A164823 for explanatory comment and the definition of "cos(x) mod j".
LINKS
Christopher Hunt Gribble, Flattened irregular triangle, for 2 < j < 1000.
EXAMPLE
The irregular triangle of numbers without empty rows is:
..j....Nonexistent values of cos(2*Pi/k) mod j
..4....2
..5....3
..7....2..5
.11....3..8
.13....3..8..9
.17....2..5.10
.19....3..4.15.16
.23....4.10.13.19
.29....4.19.22.27
.31....2..5.10.11.20.21.26.29
.37....3..6..9.15.20.24.25.32.33
.41....5..6.10.11.33.37
.43....3..8..9.13.20.23.30.34.35.40
.47....4.10.18.19.28.29.37.43
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Christopher Hunt Gribble, Sep 22 2009
EXTENSIONS
Minor edits from N. J. A. Sloane, Sep 25 2009
Minor edit by Christopher Hunt Gribble, Oct 01 2009
STATUS
approved