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 A078705 #9 Nov 18 2017 09:07:08
%S A078705 1,1,2,2,2,3,2,3,3,4,3,5,3,4,4,5,4,6,4,6,5,6,4,7,5,6,6,7,5,8,5,7,6,7,
%T A078705 6,9,6,7,7,9,6,9,6,9,8,8,6,11,7,9,8,9,7,10,8,10,8,9,7,12,7,9,10,11,9,
%U A078705 12,8,11,9,12,8,13,8,10,11,11,9,12,8,13,11,11,9,14,10,11,10,13,9,15,10,12,11
%N A078705 Integer part of the square root of sigma(n).
%H A078705 Antti Karttunen, <a href="/A078705/b078705.txt">Table of n, a(n) for n = 1..16384</a>
%H A078705 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>
%F A078705 a(n) = A000196(A000203(n)). - _Antti Karttunen_, Nov 18 2017
%t A078705 Table[Floor[Sqrt[DivisorSigma[1, i]]], {i, 1, 100}]
%o A078705 (Scheme) (define (A078705 n) (A000196 (A000203 n))) ;; [For the implementations of A000196 and A000203, see under the respective entries]. - _Antti Karttunen_, Nov 18 2017
%o A078705 (PARI) a(n) = sqrtint(sigma(n)); \\ _Michel Marcus_, Nov 18 2017
%Y A078705 Cf. A000196, A000203.
%K A078705 easy,nonn,look
%O A078705 1,3
%A A078705 _Joseph L. Pe_, Dec 18 2002