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 A164846 Triangle read by rows: frequency with which the number of values taken by cos(2*pi/k) mod j occurs for each j >= 1, taken over k = 1:j-1. 5
 0, 0, 1, 0, 1, 1, 0, 2, 1, 0, 0, 1, 3, 0, 0, 0, 3, 0, 0, 1, 1, 0, 2, 3, 0, 1, 0, 0, 0, 4, 0, 0, 2, 0, 0, 1, 0, 3, 1, 1, 2, 0, 1, 0, 0, 0, 3, 2, 0, 1, 2, 0, 0, 1, 0, 0, 2, 5, 1, 1, 0, 1, 0, 0, 0, 0, 0, 6, 0, 0, 3, 0, 0, 0, 0, 0, 0, 2, 0, 3, 6, 0, 2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 5, 2, 0, 2, 1, 0, 0, 1, 2, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,8 COMMENTS The triangle of numbers is: ..j....Frequency of numbers of solutions over k .......0..1..2..3..4..5..6..7..8..9..10 ..1....0 ..2....0..1 ..3....0..1..1 ..4....0..2..1..0 ..5....0..1..3..0..0 ..6....0..3..0..0..1..1 ..7....0..2..3..0..1..0..0 ..8....0..4..0..0..2..0..0..1 ..9....0..3..1..1..2..0..1..0..0 .10....0..3..2..0..1..2..0..0..1..0 .11....0..2..5..1..1..0..1..0..0..0..0 LINKS C. H. Gribble, Flattened triangle, for j = 1:100 and k = 1:j-1. CROSSREFS Cf. A164822, A164823, A164831, A165252. Sequence in context: A236263 A319572 A108063 * A026729 A109466 A259095 Adjacent sequences:  A164843 A164844 A164845 * A164847 A164848 A164849 KEYWORD nonn,tabl AUTHOR Christopher Hunt Gribble, Aug 28 2009 EXTENSIONS Minor edits from N. J. A. Sloane, Sep 01 2009 Sequence corrected by Christopher Hunt Gribble, Sep 10 2009 Minor edits by Christopher Hunt Gribble, Oct 01 2009 STATUS approved

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Last modified January 20 16:44 EST 2019. Contains 319335 sequences. (Running on oeis4.)