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 A116014 #14 May 19 2019 13:11:32
%S A116014 2,9,19,98,141,176,319,396,467,691,729,970,1113,1279,1447,1473,1873,
%T A116014 1974,2403,3712,5208,5965,6777,7183,8353,8769,8881,8962,10137,10180,
%U A116014 10771,11314,12016,12241,13624,15196,19683,19705,20053,20553,21241
%N A116014 Numbers k such that k + sigma(k) + sigma(sigma(k)) is a square.
%H A116014 John Cerkan, <a href="/A116014/b116014.txt">Table of n, a(n) for n = 1..10000</a>
%e A116014 1113 + sigma(1113) + sigma(sigma(1113)) = 89^2.
%t A116014 okQ[n_]:=Module[{dsn=DivisorSigma[1,n]}, IntegerQ[Sqrt[n+dsn+DivisorSigma[1,dsn]]]]; Select[Range[22000],okQ] (* _Harvey P. Dale_, Jan 23 2011 *)
%o A116014 (PARI) is(n)=my(s=sigma(n)); issquare(n+s+sigma(s)) \\ _Charles R Greathouse IV_, Jul 30 2016
%Y A116014 Cf. A116012, A116013, A116015.
%K A116014 nonn
%O A116014 1,1
%A A116014 _Giovanni Resta_, Feb 13 2006