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 A065810 #8 Jun 10 2021 22:30:59 %S A065810 1,4,7,10,13,46,49,64,67,79,112,124,127,139,151,232,244,262,310,325, %T A065810 349,352,364,403,415,418,442,457,505,571,583,661,685,766,769,850,874, %U A065810 952,964,1057,1126,1432,1519,1552,1639,1945,2014,2050,2140,2434,2458 %N A065810 Sorted positions of the elements of the quasicyclic group Z+(2a+1)/(2^b) [a > 0 and a < 2^(b-1), b > 0] at the ]0,1[ side of the Stern-Brocot Tree (A007305/A007306). %C A065810 It is easily proved that in the denominators given by A007306, the even values occur only at every third position, but can one find a simple rule for these positions of the denominators which are the powers of 2 only? %H A065810 <a href="/index/St#Stern">Index entries for sequences related to Stern's sequences</a> %Y A065810 Permutation of A065674. Cf. A065811, A065812. Gives the positions of zeros in A065936. %K A065810 nonn %O A065810 1,2 %A A065810 _Antti Karttunen_, Nov 22 2001