A080939 - OEIS

A080939

a(1)=3; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

%I #6 Mar 30 2012 16:49:42

%S 3,8,6,11,16,14,19,17,22,27,25,30,35,33,38,36,34,39,37,42,47,45,50,55,

%T 53,58,56,61,66,64,69,74,72,70,68,66,64,62,60,65,70,68,73,78,76,81,79,

%U 84,89,87,92,97,95,100,98,96,101,99,104,102,100,98,103,101,99

%N a(1)=3; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise.

%H 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 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)

%F a(n)-n (n >= 1) is periodic with period 168.

%Y Cf. A080578, A080900, A080901.

%K nonn,easy

%O 1,1

%A _N. J. A. Sloane_ and Benoit Cloitre, Apr 04 2003