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A164822
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Triangle read by rows, giving the number of values taken by cos (2*pi/k) mod j, for j >= 2 and k = 1:j-1.
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5
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1, 1, 2, 1, 2, 1, 1, 2, 2, 2, 1, 4, 1, 5, 1, 1, 2, 2, 2, 1, 4, 1, 4, 1, 7, 1, 4, 1, 1, 2, 3, 4, 1, 6, 1, 4, 1, 4, 2, 5, 1, 8, 1, 5, 2, 1, 2, 2, 2, 3, 4, 1, 2, 2, 6, 1, 4, 1, 11, 1, 4, 1, 11, 1, 4, 1, 1, 2, 2, 2, 1, 4, 4, 2, 2, 2, 1, 6, 1, 4, 2, 5, 1, 8, 1, 9, 2, 4, 1, 9, 1, 1, 4, 2, 8, 1, 8, 1, 8, 2, 4, 1, 14, 1
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| C. H. Gribble, Flattened triangle, for j = 2:100 and k = 1:j-1.
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EXAMPLE
| The triangle of numbers is:
.....k..1..2..3..4..5..6..7..8..9.10
..j..
..2.....1
..3.....1..2
..4.....1..2..1
..5.....1..2..2..2
..6.....1..4..1..5..1
..7.....1..2..2..2..1..4
..8.....1..4..1..7..1..4..1
..9.....1..2..3..4..1..6..1..4
.10.....1..4..2..5..1..8..1..5..2
.11.....1..2..2..2..3..4..1..2..2..6
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CROSSREFS
| Cf. A164823, A164831, A164846, A165252.
Sequence in context: A065373 A047895 A178474 * A110627 A205107 A087187
Adjacent sequences: A164819 A164820 A164821 * A164823 A164824 A164825
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KEYWORD
| nonn,tabl
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AUTHOR
| Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Aug 27 2009
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EXTENSIONS
| Sequence and definition corrected by Christopher Hunt Gribble (chris.eveswell(AT)virgin.net), Sep 10 2009
Minor edit by N. J. A. Sloane, Sep 13 2009
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