Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
0,5
Let us call integers m and n collinear one to another if either A059905(m)=A059905(n) or A059906(m)=A059906(n). Then a(n) is the number of noncollinear to n nonnegative integers not exceeding n.
Table of n, a(n) for n=0..63.
Theorem: a(2n)=a(2n+1).
Cf. A000695, A054238, A059905, A059906.
Sequence in context: A145787 A096111 A101081 * A038716 A168659 A035642
Adjacent sequences: A147792 A147793 A147794 * A147796 A147797 A147798
nonn
Vladimir Shevelev, Nov 13 2008
More terms from Philippe Deléham, Oct 18 2011
approved