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 A380927 #3 Mar 03 2025 11:14:32 %S A380927 49,1029,9317,11858,15092,19208,21609,195657,199927,221221,244783, %T A380927 249018,281554,311542,316932,319319,396508,403368,406406,453789, %U A380927 517244,1771561,2254714,2869636,3652264,4108797,4198467,4645641,4648336,5140443,5229378,5812079,5912634 %N A380927 Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = -5. %e A380927 517244 = 2^2*7^3*13*29 = 517244*2/(2-5) +517244*3/(7-5) + 517244/(13-5) + 517244/(29-5) %p A380927 with(numtheory): P:=proc(q, h) local k, n, v; v:=[]; %p A380927 for n from 1 to q do if n mod 5>0 then if n=add(n*k[2]/(k[1]+h), k=ifactors(n)[2]) then v:=[op(v), n]; %p A380927 fi; fi; od; op(v); end: P(6949250, -5); %Y A380927 Cf. A380888, A380889, A380900, A380901, A380923-A380926, A380928. %K A380927 nonn,easy %O A380927 1,1 %A A380927 _Paolo P. Lava_, Mar 03 2025