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 A387711 #11 Sep 06 2025 13:55:15
%S A387711 4,8,12,16,18,20,24,27,28,30,32,36,40,42,44,45,48,50,52,54,56,60,63,
%T A387711 64,66,68,70,72,76,78,80,81,84,88,90,92,96,100,102,104,108,112,114,
%U A387711 116,120,124,126,128,132,135,136,138,140,144,148,150,152,156,160,162,164,168,172,174,176,180,184,186,188,189,192,196
%N A387711 Numbers k for which A003959(k) > 2*k, where A003959 is multiplicative with a(p^e) = (p+1)^e.
%H A387711 Antti Karttunen, <a href="/A387711/b387711.txt">Table of n, a(n) for n = 1..10000</a>
%o A387711 (PARI)
%o A387711 A003959(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1]++); factorback(f); };
%o A387711 is_A387711(n) = (A003959(n)>(2*n));
%Y A387711 Cf. A003959, A387710.
%Y A387711 Disjoint union of A387712 and A387713. Positions of nonzero terms in A387715.
%Y A387711 Subsequence of A005101, and of A246282.
%Y A387711 After the initial 4 also a subsequence of A033942.
%K A387711 nonn,new
%O A387711 1,1
%A A387711 _Antti Karttunen_, Sep 06 2025