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 A049228 #16 Aug 10 2024 22:33:44 %S A049228 25,49,1156,2809,1369,169,225,3025,4489,5929,441,5329,25281,10609, %T A049228 37249,10609,27889,24649,1225,22801,80089,37249,85849,34225,187489, %U A049228 1849,208849,157609,76729,2401,82369,267289,64009,130321,3771364,555025,966289,310249,344569 %N A049228 sigma(n)-n is a perfect square associated with A049226. %H A049228 Amiram Eldar, <a href="/A049228/b049228.txt">Table of n, a(n) for n = 1..300</a> %F A049228 a(n) = A000203(A049226(n)) - A049226(n). - _Amiram Eldar_, Aug 15 2019 %e A049228 a(27) = 208849 = 457^2 is a term since sigma(A049226(27)) - A049226(27) = 208849. %Y A049228 Cf. A000005, A000203, A049226, A049227. %K A049228 easy,nonn %O A049228 1,1 %A A049228 _Enoch Haga_ %E A049228 Offset corrected and more terms added by _Amiram Eldar_, Aug 15 2019