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%I #6 Mar 30 2012 18:50:25
%S 3,15,15,105,1155,15015,255255,4849845,140645505,4360010655,
%T 178760436855,7686698784765,453515228301135,27664428926369235,
%U 1964174453772215685,143384735125371745005,14481858247662546245505
%N Denominator of Sum{1/A077800(k)|1<=k<=n}, numerator=A074042.
%C For n>2, a(n) = A048599(n-1).
%C A074042(n)/a(n) -> Brun's constant (A065421).
%Y Essentially the same as A048599.
%K nonn,frac
%O 1,1
%A _Reinhard Zumkeller_, Aug 13 2002
%E Edited by _Max Alekseyev_, May 10 2009
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