A147795 If n=A000695(k_n)+2*A000695(l_n), then a(n) is the number of nonnegative integers m<n such that k_m differs from k_n and l_m differs from l_n.

0, 0, 1, 1, 2, 2, 3, 3, 6, 6, 7, 7, 8, 8, 9, 9, 12, 12, 13, 13, 14, 14, 15, 15, 18, 18, 19, 19, 20, 20, 21, 21, 28, 28, 29, 29, 30, 30, 31, 31, 34, 34, 35, 35, 36, 36, 37, 37, 40, 40, 41, 41, 42, 42, 43, 43, 46, 46, 47, 47, 48, 48, 49, 49

Offset

0,5

Comments

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.

Links

Table of n, a(n) for n=0..63.

Formula

Theorem: a(2n)=a(2n+1).

Crossrefs

Cf. A000695, A054238, A059905, A059906.

Sequence in context: A358337 A101081 A373612 * A258186 A357415 A038716

Adjacent sequences: A147792 A147793 A147794 * A147796 A147797 A147798

Keyword

nonn

Author

Vladimir Shevelev, Nov 13 2008

Extensions

More terms from Philippe Deléham, Oct 18 2011

Status

approved