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 A372098 #10 Apr 26 2025 01:29:42 %S A372098 -1,0,1,2,4,7,8,12,15,18,25,26,30,51,75,78,84,129,133,148,170,180,183, %T A372098 189,209,265,279,285,287,336,369,388,406,412,445,469,496,581,711,737, %U A372098 741,742,873,939,994,1044,1078,1111,1157,1158,1492,1636,1767,1914,1933 %N A372098 a(n) = A070939(3^k) - 2*A000120(3^k) with k = A372097(n). %C A372098 a(n)/2 are the negated differences at supporting points of the lower envelope of the scatter band of the deviation of the binary weight of 3^k from half the length of the corresponding binary number. %H A372098 Hugo Pfoertner, <a href="/A372098/b372098.txt">Table of n, a(n) for n = 1..99</a> %Y A372098 Cf. A000120, A000244, A011754, A070939, A078839, A372097, A372099, A372100. %K A372098 sign %O A372098 1,4 %A A372098 _Hugo Pfoertner_, Apr 25 2024