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 A072462 #14 Aug 11 2023 09:59:55 %S A072462 2,4,8,16,18,25,32,36,64,72,98,128,144,162,169,196,225,242,256,288, %T A072462 289,324,392,484,512,576,648,722,784,841,882,968,1024,1058,1152,1225, %U A072462 1250,1296,1369,1444,1458,1521,1568,1681,1764,1922,1936,2025,2048,2116,2178 %N A072462 Numbers k such that sigma(k) == 3 (mod 4). %H A072462 Ray Chandler, <a href="/A072462/b072462.txt">Table of n, a(n) for n = 1..10000</a> %t A072462 Select[Range[2200], Mod[DivisorSigma[1, #], 4] == 3 &] (* _Michael De Vlieger_, Aug 10 2023 *) %o A072462 (PARI) isok(n) = ((sigma(n) % 4) == 3); \\ _Michel Marcus_, Dec 19 2013 %Y A072462 Cf. A000203, A028982, A072461. %K A072462 nonn %O A072462 1,1 %A A072462 _Labos Elemer_, Jun 19 2002 %E A072462 Name edited by _Michel Marcus_, Dec 19 2013