This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A117554 #6 Oct 02 2013 16:16:06 %S A117554 1,3,12,19,34,53,118,441,612,730,1171,1783,2513,4296,25164,52841, %T A117554 73709,78005 %N A117554 Equal divisions of the octave of decreasing 5-limit Pepper ambiguity. %C A117554 We may define the p-limit Pepper ambiguity, for any odd prime p, as the maximum of the ratios of the errors of the nearest approximation to the members of the p-limit tonality diamond to the next nearest. In the 5-limit, that means we look at the ratios of the errors for the nearest approximations to 3/2, 5/4 and 5/3 to the next nearest. %C A117554 The 3-limit version of this is A005664, so in some sense this is a generalization of that. However it is also very closely related to A054540. %H A117554 Wikipedia, <a href="http://en.wikipedia.org/wiki/Tonality_diamond">Tonality diamond</a> %Y A117554 Cf. A117555, A117556, A117557, A117558, A117559, A005664, A054540. %K A117554 more,nonn %O A117554 0,2 %A A117554 _Gene Ward Smith_, Mar 28 2006