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Search: id:A007503
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| A007503 |
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Number of subgroups of dihedral group: sigma(n)+d(n).
(Formerly M1321)
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+0
9
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| 2, 5, 6, 10, 8, 16, 10, 19, 16, 22, 14, 34, 16, 28, 28, 36, 20, 45, 22, 48, 36, 40, 26, 68, 34, 46, 44, 62, 32, 80, 34, 69, 52, 58, 52, 100, 40, 64, 60, 98, 44, 104, 46, 90, 84, 76, 50, 134, 60, 99, 76, 104, 56, 128, 76, 128
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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David W. Jensen and Eric R. Bussian, A Number-Theoretic Approach to Counting Subgroups of Dihedral Groups, Two-Year College Math. Jnl., 23 (1992), 150-152.
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LINKS
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T. D. Noe, Table of n, a(n) for n = 1..1000
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FORMULA
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G.f.: sum(k>=1, 1/(1-x^k)^2) - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2003
G.f.: sum(i=1, oo, (1+i)/(1-x^i)) - Jon Perry (perry(AT)globalnet.co.uk), Jul 03 2004
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CROSSREFS
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Adjacent sequences: A007500 A007501 A007502 this_sequence A007504 A007505 A007506
Sequence in context: A051677 A122965 A054463 this_sequence A112967 A109150 A004202
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KEYWORD
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nonn
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AUTHOR
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njas, Robert G. Wilson v (rgwv(AT)rgwv.com)
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