Search: id:A093431
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%I A093431
%S A093431 1,3,7,13,31,38,113,165,265,420,1607,1004,3979,6893,4205,8665,40903,
%T A093431 49558,315477,162320,79179,269877,1647123,937552,1810091,8445653,
%U A093431 7791355,3978237,33071543,19578860,283536169,327438713,117635955
%N A093431 a(n)=sum_{k=1..n}(LCM(n,n-1,...,n-k+2,n-k+1)/LCM(1,2,...,k)).
%C A093431 Comment from Jeremy Gardiner, Dec 28 2008: The following sequences all 
               appear to have the same parity: A003071, A029886, A061297, A092524, 
               A093431, A102393, A104258, A122248, A128975.
%p A093431 a:=n->add(lcm(seq(i,i=n-k+1..n))/lcm(seq(j,j=1..k)),k=1..n): seq(a(n),
               n=1..40); (Deutsch)
%Y A093431 Cf. A093430, A093432, A093433.
%Y A093431 Row sums of A093430.
%Y A093431 Sequence in context: A100750 A105435 A117708 this_sequence A083520 A162869 
               A079018
%Y A093431 Adjacent sequences: A093428 A093429 A093430 this_sequence A093432 A093433 
               A093434
%K A093431 nonn
%O A093431 1,2
%A A093431 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 31 2004
%E A093431 Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), 
               Jan 30 2006

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