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 A069262 #30 Sep 08 2022 08:45:05
%S A069262 16,36,100,196,484,676,1156,1444,2116,3364,3844,5476,6724,7396,8836,
%T A069262 11236,13924,14884,17956,20164,21316,24964,27556,31684,37636,40804,
%U A069262 42436,45796,47524,51076,64516,68644,75076,77284,88804,91204,98596
%N A069262 a(n) = 4*prime(n)^2.
%C A069262 Previous name was: Numbers n such that sum(d|n,(-1)^d) = 3.
%H A069262 Vincenzo Librandi, <a href="/A069262/b069262.txt">Table of n, a(n) for n = 1..1000</a>
%F A069262 a(n) = 4*prime(n)^2 = 4*A001248(n).
%F A069262 Numbers k such that A048272(k) = -3.
%F A069262 Sum_{n>=1} 1/a(n) = P(2)/4, where P is the prime zeta function. - _Amiram Eldar_, Dec 19 2020
%t A069262 4 Prime[Range[40]]^2 (* _Vincenzo Librandi_, Mar 27 2014 *)
%o A069262 (Magma) [4*p^2: p in PrimesUpTo(200)]; // _Vincenzo Librandi_, Mar 27 2014
%o A069262 (PARI) a(n) = 4*prime(n)^2; \\ _Michel Marcus_, Mar 23 2016
%o A069262 (PARI) lista(nn) = {forprime(p=2, nn, print1(4*p^2, ", "));} \\ _Altug Alkan_, Mar 23 2016
%Y A069262 Cf. A001248, A048272.
%K A069262 easy,nonn
%O A069262 1,1
%A A069262 _Benoit Cloitre_, Apr 14 2002
%E A069262 New name from existing formula by _Michel Marcus_, Mar 23 2016