%I #11 Jun 24 2014 01:16:21
%S 1,2,3,6,7,18,19,23,33,34,38,66,67,77,101,102,110,111,113,114,115,119,
%T 120,129,133,134,136,172,173,185,189,190,192,193,196,224,225,235,287,
%U 288,306,307,339,340,352,367,405,406,420,452,453,465,466
%N a(1)=1; thereafter, values of n for which r(n)-r(n-1) and r(n-1)-r(n-2) have the same sign, where r(n) = A005132(n).
%H <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a>
%e E.g., going from r(4)=2 to r(5)=7 to r(6)=13 we increase twice in a row, so 6 is a member. Going from r(21)=63 to r(22)=41 to r(23)=18 we decrease twice in a row, so 23 is a member.
%Y Cf. A005132.
%K nonn
%O 1,2
%A _Allan Wilks_, Oct 30 2001
%E Better description from _Dean Hickerson_, Feb 15 2006