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 A365270 #36 Oct 17 2023 07:38:23 %S A365270 1,2,4,6,8,12,16,18,20,24,28,30,32,36,40,42,48,54,56,60,64,66,72,80, %T A365270 84,88,90,96,100,104,108,112,120,126,128,132,140,144,150,156,160,162, %U A365270 168,176,180,192,196,198,200,204,208,210,216,220,224,228,234,240,252,256 %N A365270 Practical numbers that have middle divisors. %C A365270 Very similar to A174973 from which differs at a(195) = 1014 here and 1020 there. %C A365270 It appears that these are also the practical numbers k whose symmetric representation of sigma(k) has an odd number of parts. %e A365270 a(195) = 1014 is a practical number (A005153) and it has two middle divisors so 1014 is in the sequence. %Y A365270 Intersection of A005153 and A071562. %Y A365270 Cf. A067742, A174973, A236104, A237270, A237271, A237591, A237593, A317412. %K A365270 nonn %O A365270 1,2 %A A365270 _Omar E. Pol_, Aug 30 2023