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 A274038 #29 May 15 2025 17:11:30 %S A274038 2,6,24,40,104,94,728,248,376,614,611394,584,1880,3055,2632,1570 %N A274038 Least number k such that the sum of squares of positive divisors of k is the sum of two nonzero squares in exactly n ways. %C A274038 Least number k such that A001157(k) is the sum of two nonzero squares in exactly n ways. %C A274038 Additional terms for n > 16: ?, 2914, ?, 2456, 21490, 18330, 13160, 4216, 40152, ?, 11656, 17192, ?, 12280, 156570, 9734, 4306794, ?, 431634, 17954, 411558, 173992, ?, 22922, 77080, 85960... - _Lars Blomberg_, Sep 20 2017 %C A274038 A001157(a(n)) >= A016032(n). - _Max Alekseyev_, Feb 02 2025 %C A274038 a(17) >= 10^20 if it exists. - _Max Alekseyev_, May 15 2025 %e A274038 a(2) = 6 because 6 is divisible by 1, 2, 3, 6. 1^2 + 2^2 + 3^2 + 6^2 = 1^2 + 7^2 = 5^2 + 5^2. %Y A274038 Cf. A001157, A016032. %K A274038 nonn,more %O A274038 1,1 %A A274038 _Altug Alkan_, Jun 13 2016 %E A274038 a(11) from _Giovanni Resta_, Jun 13 2016 %E A274038 a(14)-a(16) from _Lars Blomberg_, Sep 20 2017