%I A081031
%S A081031 1,3,4,6,8,9,11,13,15,16,18,20,21,23,25,27,28,30,32,33,35,37,39,40,42,
%T A081031 44,45,47,49,51,52,54,56,57,59,61,63,64,66,68,69,71,73,75,76,78,80,81,
%U A081031 83,85,87,88
%N A081031 Positions of white keys on piano keyboard.
%F A081031 a(n) = [(12n-3)/7]
%e A081031 First, 3rd, 4th, 6th, etc. keys of piano keyboard are white.
%Y A081031 Cf. A059620, A081032.
%Y A081031 Sequence in context: A059535 A061402 A047206 this_sequence A133280 A138097 
               A000592
%Y A081031 Adjacent sequences: A081028 A081029 A081030 this_sequence A081032 A081033 
               A081034
%K A081031 fini,full,nonn
%O A081031 1,2
%A A081031 David W. Wilson (davidwwilson(AT)comcast.net), Mar 02 2003