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Search: id:A051881
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| A051881 |
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Number of subgroups of order n in special orthogonal group SO(3). |
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+0
2
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| 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1
(list; graph; listen)
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OFFSET
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1,4
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FORMULA
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Has period 1, 2 except for a(2) = 1, a(12) = a(24) = a(60) = 3.
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EXAMPLE
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The groups are "nn", of order n; "22n", of order 2n; "332", "432", "532" of orders 12,24,60.
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CROSSREFS
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The main sequences concerned with group theory are A000001, A000679, A001034, A001051, A001228, A005180, A000019, A000637, A000638, A002106, A005432, A051881.
Sequence in context: A161275 A160979 A167679 this_sequence A081757 A033107 A083897
Adjacent sequences: A051878 A051879 A051880 this_sequence A051882 A051883 A051884
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KEYWORD
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nonn,easy,nice
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AUTHOR
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J. H. Conway, conway(AT)math.princeton.edu
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu) and David W. Wilson (davidwwilson(AT)comcast.net) Dec 16 1999
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