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 A380900 #9 Mar 02 2025 23:48:09 %S A380900 3,125,16807,29155,33275,50575,90475,7761061,8857805,11796113, %T A380900 13463065,20462645,21102389,24084445,35496425,36606185,63500525, %U A380900 65485805,73776725,99798725,113597825,117779585,178056445,193155305,200599525,203878325,204311525,251218345 %N A380900 Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = -2. %e A380900 29155 = 5*7^3*17 = 29155/(5-2) + 29155*3/(7-2) + 29155/(17-2) %p A380900 with(numtheory): P:=proc(q,h) local k,n,v; v:=[]; %p A380900 for n from 1 by 2 to q do if n=add(n*k[2]/(k[1]+h),k=ifactors(n)[2]) then v:=[op(v),n]; fi; %p A380900 od; op(v); end: P(251218345,-2); %Y A380900 Cf. A380888, A380889, A380901, A380923-A380928. %K A380900 nonn %O A380900 1,1 %A A380900 _Paolo P. Lava_, Feb 09 2025