%I #9 Jan 17 2021 22:51:29

%S 135,136,149,150,151,164,165,166,179,180,181,195,196,209,210,211

%N Sparse rulers with length a(n) cannot be perfect rulers.

%C a(n) is in this list if and only if A103300(a(n)) = 0. These values were found by Arch D. Robison, see the links section.

%C For definitions related to sparse rulers see A103294.

%H Peter Luschny, <a href="http://oeis.org/wiki/User:Peter_Luschny/PerfectRulers">Perfect and optimal rulers.

%H Peter Luschny, <a href="http://luschny.de/math/rulers/rulercnt.html">Perfect and optimal rulers counts.

%H Arch D. Robison, <a href="http://software.intel.com/articles/parallel-computation-of-sparse-rulers">Parallel Computation of Sparse Rulers</a>, Jan 14 2014.

%H <a href="/index/Per#perul">Index entries for sequences related to perfect rulers.</a>

%Y Cf. A103300, A103294.

%K nonn,more

%O 1,1

%A _Peter Luschny_, Jul 14 2020