cp's OEIS Frontend

A080640 a(1) = 3; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "n is a member of the sequence if and only if a(n) is divisible by 4".

%I A080640 #10 Mar 30 2012 17:27:18
%S A080640 3,5,8,9,12,13,14,16,20,21,22,24,28,32,33,36,37,38,39,40,44,48,49,52,
%T A080640 53,54,55,56,57,58,59,60,64,65,66,68,72,76,80,84,85,86,87,88,89,90,91,
%U A080640 92,96,97,98,100,104,108,112,116,120,124,128,132,133,134,135,136,140,144
%N A080640 a(1) = 3; for n>1, a(n) is taken to be the smallest integer greater than a(n-1) which is consistent with the condition "n is a member of the sequence if and only if a(n) is divisible by 4".
%H A080640 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">Numerical analogues of Aronson's sequence</a>, J. Integer Seqs., Vol. 6 (2003), #03.2.2.
%H A080640 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://arXiv.org/abs/math.NT/0305308">Numerical analogues of Aronson's sequence</a> (math.NT/0305308)
%H A080640 <a href="/index/Aa#aan">Index entries for sequences of the a(a(n)) = 2n family</a>
%F A080640 {a(a(n))} = {6, 4i, i >= 3}.
%Y A080640 Cf. A080639, A079000.
%K A080640 nonn,easy
%O A080640 1,1
%A A080640 _N. J. A. Sloane_ and Benoit Cloitre, Feb 28 2003
%E A080640 More terms from _Matthew Vandermast_, Feb 28 2003