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 A168086 #7 Nov 19 2023 12:06:16 %S A168086 1,4,9,16,24,25,30,36,40,42,48,49,54,56,64,66,70,78,80,81,88,100,102, %T A168086 104,105,110,112,114,120,121,128,130,135,136,138,144,152,154,162,165, %U A168086 168,169,170,174,176,182,184,186,189,190,192,195,196,208,210,216,222 %N A168086 Numbers k such that d(k) is not an isolated number. %C A168086 A000005 = A167759 U A168086. Where 0,1,3,5,7,8,9,10,11,13,14,15,16,17,19,20,21,22,.. are nonisolated numbers A167707. The nonisolated numbers of divisors of n. The positions of isolated numbers in A000005. %F A168086 A000005(a(n)) = nonisolated number. %e A168086 A000005(a(1)=1)=1, A000005(a(2)=4)=3, A000005(a(3)=9)=3. %Y A168086 Cf. A000005, A167759, A167707. %K A168086 nonn %O A168086 1,2 %A A168086 _Juri-Stepan Gerasimov_, Nov 18 2009 %E A168086 Corrected (132, 140, 148 removed, 152 inserted etc.) by _R. J. Mathar_, Jun 04 2010