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 A117002 #11 Aug 23 2024 11:42:14
%S A117002 1,6,10,16,18,30,26,42,37,54,42,76,50,78,72,94,66,120,74,126,104,126,
%T A117002 90,180,103,150,136,182,114,222,122,210,168,198,156,286,146,222,200,
%U A117002 288,162,312,170,294,258,270,186,400,201,324,264,350,210,408,252,396,296,342,234
%N A117002 a(n) = sigma(n) + 3*A079667(n).
%D A117002 H. J. S. Smith, Report on the Theory of Numbers, reprinted in Vol. 1 of his Collected Math. Papers, Chelsea, NY, 1979, see p. 322.
%H A117002 Michael De Vlieger, <a href="/A117002/b117002.txt">Table of n, a(n) for n = 1..10000</a>
%t A117002 Table[DivisorSigma[1,n]+3DivisorSum[n,Abs[n/#-#]&,#<=Sqrt[n]&],{n, 59}] (* _James C. McMahon_, Aug 23 2024 *)
%Y A117002 Cf. A000203, A079667.
%K A117002 nonn
%O A117002 1,2
%A A117002 _N. J. A. Sloane_, Apr 15 2006