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%I #9 Jul 13 2013 12:03:35
%S 21,21,23,21,23,21,21,23,21,23,21,23,21,21,23,21,23,21,23,21,21,23,21,
%T 23,21,23,21,21,23,21,23,21,23,21,21,23,21,23,21,23,21,21,23,21,23,21,
%U 23,21,21,23,21,23,21,23,21,21,23
%N First differences of A001682.
%C a(n) = A001682(n+1) - A001682(n).
%H Reinhard Zumkeller, <a href="/A151910/b151910.txt">Table of n, a(n) for n = 1..1000</a>
%o (Haskell)
%o a151910 n = a151910_list !! (n-1)
%o a151910_list = zipWith (-) (tail a001682_list) a001682_list
%o -- _Reinhard Zumkeller_, Oct 10 2011
%K nonn
%O 1,1
%A _Harvey P. Dale_, Aug 08 2009
%E Offset corrected and initial term added by _Reinhard Zumkeller_, Oct 10 2011
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