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 A380926 #4 Mar 03 2025 11:14:10 %S A380926 64,2000,2187,2448,62500,76500,93636,110484,159300,514836,1953125, %T A380926 2390625,2576816,2926125,3452625,3581577,4009008,4226013,4365680, %U A380926 4615408,4730352,4866800,4978125,5581488,6084477,6093225,6810608,6820400,7396400,8047600,8909109,9456240 %N A380926 Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = 4. %e A380926 514836 = 2^2*3^4*7*227 = 514836*2/(2+4) + 514836*4/(3+4) + 514836/(7+4) + 514836/(227+4) %p A380926 with(numtheory): P:=proc(q, h) local k, n, v; v:=[]; %p A380926 for n from 1 to q do if n=add(n*k[2]/(k[1]+h), k=ifactors(n)[2]) then v:=[op(v), n]; %p A380926 fi; od; op(v); end: P(9456240, 4); %Y A380926 Cf. A380888, A380889, A380900, A380901, A380923-A380925, A380927, A380928. %K A380926 nonn,easy %O A380926 1,1 %A A380926 _Paolo P. Lava_, Mar 03 2025