Search: id:A076217
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%I A076217
%S A076217 1,3,3,7,2,8,1,9,9,19,8,20,7,21,6,22,5,23,4,24,3,25,2,26,1,27,27,55,26,
%T A076217 56,25,57,24,58,23,59,22,60,21,61,20,62,19,63,18,64,17,65,16,66,15,67,
%U A076217 14,68,13,69,12,70,11,71,10,72,9,73,8,74,7,75,6,76,5,77,4,78,3,79,2,80
%N A076217 a(1)=1, a(n) = a(n-1) + n * (sign(n-a(n-1)).
%F A076217 If 3^n>2*m>= 2*3^(n-1); a(3^n-2*m) = m; if 3^n>2*m+1>=2*3^(n-1)+1 a(3^n-2*m-1) 
               = 3^n - m; special case of partial sum : sum(k=1, 3^n, a(k)) = (3/
               8)*(9^n-1) + (3^(n+1)-1)/2
%e A076217 a(2) = a(1)+sign(2-a(1))*2 = 1 + 2 = 3
%Y A076217 Cf. A005132.
%Y A076217 Sequence in context: A118031 A059527 A101457 this_sequence A089488 A076560 
               A096915
%Y A076217 Adjacent sequences: A076214 A076215 A076216 this_sequence A076218 A076219 
               A076220
%K A076217 nice,nonn
%O A076217 1,2
%A A076217 Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 03 2002

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