%I A073891
%S A073891 1,5,3,9,6,14,9,18,11,21,10,22,9,23,6,21,2,18,5,13,16,4,27,6,43,21,62,
%T A073891 38,81,56,103,77,130,103,162,134,195,165,232,200,271,238,311,277,356,
%U A073891 321,404,368,457,419,516,477,578,538,641,599,706,662,771,726,839,793
%V A073891 1,5,3,9,6,14,9,18,11,21,10,22,9,23,6,21,2,18,-5,13,-16,4,-27,-6,-43,-21,
               -62,-38,-81,
%W A073891 -56,-103,-77,-130,-103,-162,-134,-195,-165,-232,-200,-271,-238,-311,-277,
               -356,-321,
%X A073891 -404,-368,-457,-419,-516,-477,-578,-538,-641,-599,-706,-662,-771,-726,
               -839,-793
%N A073891 a(1) = 1, a(2n) = a(2n-1) + c(n) and a(2n+1) = a(2n) - p(n), where c(n)=A002808(n) 
               and p(n)=A000040(n) are the n-th composite and n-th prime numbers, 
               respectively.
%C A073891 All terms from a(23) onward are negative.
%Y A073891 Cf. A073892.
%Y A073891 Sequence in context: A145800 A161501 A118273 this_sequence A086970 A019955 
               A075693
%Y A073891 Adjacent sequences: A073888 A073889 A073890 this_sequence A073892 A073893 
               A073894
%K A073891 sign
%O A073891 1,2
%A A073891 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 17 2002
%E A073891 Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 13 2002