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 A239479 #18 Jun 12 2022 22:52:03 %S A239479 1,9,441,815409,553613841 %N A239479 Integer solutions of the arithmetic differential equation m' = m - sqrt(m). %C A239479 a(6) > 10^17. - _Giovanni Resta_, Mar 20 2014 %C A239479 m = k^2, where k satisfies k' = (k-1)/2. - _Charlie Neder_, Mar 08 2019 %e A239479 For m = 441 we have that m' = 420, sqrt(441) = 21 and 420 = 441 - 21. %p A239479 with(numtheory); P:= proc(q) local n,p,x; %p A239479 for n from 1 to q do x:=n^2; %p A239479 if x*add(op(2,p)/op(1,p),p=ifactors(x)[2])=n^2-n then print(n^2); %p A239479 fi; od; end: P(10^9); %Y A239479 Cf. A003415, A239478. %K A239479 nonn,more %O A239479 1,2 %A A239479 _Paolo P. Lava_, Mar 20 2014