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Search: id:A055980
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%I A055980
%S A055980 1,1,1,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,
%T A055980 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
%U A055980 4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
%N A055980 Floor[sum(1/i)], 1<=i<=n.
%C A055980 If we choose at random (uniformly) a permutation in the symmetric group 
               S_n then a(n) is the expected number of cycles (rounded down) in 
               the cycle decomposition of the permutation. - Dan Fux (dan.fux(AT)OpenGaia.com 
               or danfux(AT)OpenGaia.com), Oct 17 2001
%H A055980 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               High-WaterMark.html">High-Water Mark</a>
%H A055980 L. D. Kudryavtsev, <a href="http://eom.springer.de/H/h046540.htm">Harmonic 
               series</a>
%F A055980 a(n) ~ log(n) - Ahmed Fares (ahmedfares(AT)my-deja.com), Apr 25 2001
%F A055980 a(n)=Floor[A001008(n)/A002805(n)]. - Lekraj Beedassy (blekraj(AT)yahoo.com), 
               Sep 17 2006
%Y A055980 Cf. A004080.
%Y A055980 Sequence in context: A109829 A054125 A082528 this_sequence A076080 A134914 
               A115338
%Y A055980 Adjacent sequences: A055977 A055978 A055979 this_sequence A055981 A055982 
               A055983
%K A055980 nonn
%O A055980 1,4
%A A055980 Henry Bottomley (se16(AT)btinternet.com), Jul 20 2000

    
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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.


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