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A164846
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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.
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5
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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; internal format)
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OFFSET
| 1,8
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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
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LINKS
| C. H. Gribble, Flattened triangle, for j = 1:100 and k = 1:j-1.
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CROSSREFS
| Cf. A164822, A164823, A164831, A165252.
Sequence in context: A128519 A061670 A108063 * A026729 A109466 A076833
Adjacent sequences: A164843 A164844 A164845 * A164847 A164848 A164849
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KEYWORD
| nonn,tabl
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AUTHOR
| Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Aug 28 2009
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EXTENSIONS
| Minor edits from N. J. A. Sloane, Sep 01 2009
Sequence corrected by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Sep 10 2009
Minor edits by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Oct 01 2009
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