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 A382716 #16 Apr 13 2025 00:53:14 %S A382716 1,1,4,1,1,9,1,1,-4,1,1,1,25,-4,1,1,1,36,-1,-1,-4,-1,4,-4,49,4,1,1,-1, %T A382716 -1,-1,64,4,1,1,1,1,1,1,1,1,81,1,1,1,1,1,1,1,1,100,1,1,1,1,1,1,1,1,1, %U A382716 1,121,1,1,1,1,1,1,1,1,1,1,144,1,1,1,1,1,1,1,1,1,1,1,1,-1,-1,-1,-9,4,1,1,1,1,1,1,1,196,-1,-4,-1,-1,4,-9 %N A382716 a(n) = n - A382715(n). %C A382716 Assuming that every integer appears in A377901, a(n) gives an indication of how difficult it was for the positive integer n to appear there. %C A382716 (The definition of A377091 implies that |a(n)| is a square.) %H A382716 N. J. A. Sloane, <a href="/A382716/b382716.txt">Table of n, a(n) for n = 1..10059</a> %Y A382716 Cf. A377091, A382715. %Y A382716 For RECORDS, see A382717, A382718, A379789. %K A382716 sign %O A382716 1,3 %A A382716 _N. J. A. Sloane_, Apr 09 2025