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 A204996 #5 Mar 30 2012 18:58:09 %S A204996 4,9,4,9,9,16,16,9,25,36,36,16,49,64,16,25,81,81,100,36,25,144,144,25, %T A204996 100,196,36,64,225,64,256,36,49,324,36,81,361,400,64,49,441,100,484, %U A204996 144,49,576,576,49,196,225,100,196,729,144,64,81,121,900,900,64 %N A204996 Least k^2 such that n divides k^2-j^2 for some j<k. %C A204996 For a guide to related sequences, see A204892. %t A204996 (See the program at A204994.) %Y A204996 Cf. A204892, A204994. %K A204996 nonn %O A204996 1,1 %A A204996 _Clark Kimberling_, Jan 21 2012