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 A076215 #17 Feb 24 2018 12:07:23 %S A076215 1,5,77,92,70,195,143,3854,357,245,413,4088,2257,2222,652,679,278949, %T A076215 3366,1281,67963,1612,8555,1518,63412,1159158,2619,2725,13862,60973, %U A076215 3069,10790,3128,4620,5083,42918,3406 %N A076215 Square root of sum defined in A007475(n) and A001032(n). %C A076215 6a(n)^2 is divisible by A001032(n). Proof: Let s = A007475(n), n = A001032(n), then a(n)^2 = sum(k=s, s+n-1, k^2) = n/6*(2n^2+(6s-3)n+6s^2-6s+1). %H A076215 Christopher E. Thompson, <a href="/A076215/b076215.txt">Table of n, a(n) for n = 1..10438</a> %e A076215 A001032(3)=11, A007475(3)=18, so 18^2+19^2+...+28^2 (11 terms) = 77^2. %Y A076215 Cf. A001032, A007475. %K A076215 nonn %O A076215 1,2 %A A076215 _Ralf Stephan_, Nov 03 2002 %E A076215 Offset corrected to 1 (to match A001032) by _M. F. Hasler_, Feb 02 2016