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 A332531 #8 Feb 16 2020 02:43:48 %S A332531 442,818,1130,1226,1326,1576,2454,3094,3390,3678,3978,4728,4862,5330, %T A332531 5726,5986,6452,7362,7786,7910,8362,8398,8582,8998,9282,10166,10170, %U A332531 10250,11032,11034,11934,12410,12430,13486,13702,14184,14586,15542,15990,17178,17336 %N A332531 Even numbers k such that A103230(k) is a perfect square. %C A332531 The odd numbers k such that A103230(k) is a perfect square are the numbers that are divisible only by primes congruent to 3 mod 4 (A004614). %H A332531 Amiram Eldar, <a href="/A332531/b332531.txt">Table of n, a(n) for n = 1..10000</a> %e A332531 442 is a term since A103230(442) = 2433600 = 1560^2. %t A332531 Select[2 * Range[9000], IntegerQ @ Sqrt[Abs[DivisorSigma[1, #, GaussianIntegers -> True]]^2] &] %Y A332531 Cf. A004614, A006532, A103230. %K A332531 nonn %O A332531 1,1 %A A332531 _Amiram Eldar_, Feb 15 2020