[seqfan] A179876 = k such that mu(k) - mu(k-1) = -2 ?

Paul D Hanna pauldhanna at juno.com
Sat Sep 21 06:52:24 CEST 2013


SeqFans,      Given sequence https://oeis.org/A179876 defined by: 
Numbers h such that h and h-1 have same antiharmonic mean of the numbers k < h such that GCD(k, h) = 1. 
2, 7, 11, 23, 47, 59, 66, 70, 78, 83, 107, 130, 167, 179, 186, 195, ... 
I observed that   mu(A179876(n)) - mu(A179876(n) -1) = -2   at least for all values shown in A179876.   
Does the following definition generate the same sequence as A179876? 
 
"Numbers k such that mu(k) - mu(k-1) = -2, where mu(k) = A008683(k) is the Moebius function of k."  
  
Regards, 
     Paul 




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