Search: id:A110374
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%I A110374
%S A110374 6,30,300,2100,21840,236880,2731680,30048480,400498560,5206481280,
%T A110374 79117758720,1273944672000,21690789120000,368743415040000,
%U A110374 6993068898816000,132868309077504000,2779011281958912000
%N A110374 SUM (n!/c) where c is a composite number <=n.
%e A110374 a(8) = 8!{1/4 +1/6 +1/8}=21840.
%p A110374 a:=proc(n) local s,i :s:=0: for i from 4 to n do if isprime(i)=false 
               then s:=s+1/i else s:=s: fi od: n!*s; end; seq(a(n),n=4..23); (Deutsch)
%Y A110374 Cf. A110373.
%Y A110374 Sequence in context: A051821 A099031 A066108 this_sequence A111876 A119634 
               A075591
%Y A110374 Adjacent sequences: A110371 A110372 A110373 this_sequence A110375 A110376 
               A110377
%K A110374 easy,nonn
%O A110374 4,1
%A A110374 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 24 2005
%E A110374 More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2005

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