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 A097023 #17 Aug 13 2024 05:32:47 %S A097023 313,335,2612,2817,3015,3820,23508,34380,36647,38193,42217,50281, %T A097023 64972,73535,96404,103180,155991,265364,325847,329823,379953,397068, %U A097023 452529,476545,584748,624748,661815,668660,867636,928620 %N A097023 Numbers k such that the sum of the divisors of 2*k^2 is a square. %H A097023 Donovan Johnson, <a href="/A097023/b097023.txt">Table of n, a(n) for n = 1..200</a> %F A097023 a(n) = sqrt(A074388(n)/2). - _Amiram Eldar_, Aug 13 2024 %e A097023 sigma(2*313^2) = 543^2. %t A097023 Select[Range[950000],IntegerQ[Sqrt[DivisorSigma[1,2#^2]]]&] (* _Harvey P. Dale_, Jul 10 2012 *) %Y A097023 Cf. A000203, A008847, A074388, A097024. %K A097023 nonn %O A097023 1,1 %A A097023 _Labos Elemer_, Aug 24 2004 %E A097023 Definition clarified by _Harvey P. Dale_, Jul 10 2012