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 A007475 M3043 #33 Feb 24 2018 12:06:50 %S A007475 1,3,18,7,1,25,7,539,25,7,22,442,225,192,13,15,26914,244,50,5552,30, %T A007475 553,7,4493,83342,83,65,775,3807,64,556,20,106,132,2277,15,1788,5063, %U A007475 27,11320,280,358,1805,210,9985,802,183,71752,10123,16806,94707486,1081 %N A007475 a(n) is the smallest positive number such that the sum of A001032(n) consecutive squares starting with a(n)^2 is a square. %D A007475 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A007475 Christopher E. Thompson, <a href="/A007475/b007475.txt">Table of n, a(n) for n = 1..10438</a> %H A007475 Laurent Beeckmans, <a href="http://www.jstor.org/stable/2974904">Squares Expressible as Sum of Consecutive Squares</a>, Am. Math. Monthly, Volume 101, Number 5, pp. 437-442, May 1994. %H A007475 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a> %e A007475 a(3)=18 because A001032(3)=11 and the sum of 11 squares 18^2 + 19^2 + ... + 28^2 = 77^2. %Y A007475 Cf. A001032. %Y A007475 Square roots of sum are in A076215. %K A007475 nonn %O A007475 1,2 %A A007475 _N. J. A. Sloane_, _Mira Bernstein_ %E A007475 Better description and more terms from _Ralf Stephan_, Nov 03 2002 %E A007475 Corrected by _T. D. Noe_, Aug 25 2004 %E A007475 Offset corrected to 1 by _M. F. Hasler_, Feb 02 2016