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 A061887 #4 Aug 23 2012 15:19:50
%S A061887 0,2,3,4,8,9,10,11,12,18,19,20,21,22,23,24,32,33,34,35,36,37,38,39,40,
%T A061887 50,51,52,53,54,55,56,57,58,59,60,72,73,74,75,76,77,78,79,80,81,82,83,
%U A061887 84,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,128,129
%N A061887 n + largest square less than or equal to n; numbers in the range [2k^2,2k^2+2k] for some k.
%F A061887 a(n) = n+[sqrt(n)]^2 = n+A048760(n) = 2n-A053186(n).
%e A061887 a(15)=15+9=24; a(16)=16+16=32; a(17)=17+16=33.
%t A061887 Table[n+Floor[Sqrt[n]]^2,{n,0,70}] (* _Harvey P. Dale_, Aug 23 2012 *)
%Y A061887 Cf. A060984, A061885.
%K A061887 nonn
%O A061887 0,2
%A A061887 _Henry Bottomley_, May 12 2001