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 A194039 #11 Jan 11 2020 05:34:06
%S A194039 1,1,11,1,27,1,86,66,83,1,123,146,300,1,227,1,504,416,363,1,724,486,
%T A194039 912,1,627,1,1252,786,843,902,1544,1256,1864,1158,1227,1,2340,1820,
%U A194039 1523,1,2582,1766,3490,1938,2027,2118,4499,2306,2403,2502,2603,2706
%N A194039 Sum of nonprime divisors of n^2 + 1.
%H A194039 Amiram Eldar, <a href="/A194039/b194039.txt">Table of n, a(n) for n = 1..10000</a>
%F A194039 a(n) = A023890(n^2 + 1). - R. J. Mathar, Aug 14 2011
%e A194039 a(3) = 11 because 3^2 + 1 = 10 with the divisors {1, 2, 5, 10}, and the sum of the nonprime divisors is 1 + 10 = 11.
%t A194039 Array[ Plus @@ (Select[ Divisors[#^2+1],(!PrimeQ[#])& ])&, 75 ]
%K A194039 nonn,easy
%O A194039 1,3
%A A194039 _Michel Lagneau_, Aug 12 2011