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 A048683 #10 Jun 26 2021 20:31:09
%S A048683 1,2,3,4,5,7,8,9,11,12,13,16,17,18,19,23,24,31,32,33,35,36,40,41,42,
%T A048683 55,56,57,59,65,71,72,73,80,84,100,108,109,112,113,114,115,131,132,
%U A048683 133,155,160,161,162,163,168,183,184,199,200,201,203,209,220,224,256
%N A048683 Values of n for which the difference of maximal and central squarefree kernel numbers dividing values of {C(n,k)} or A001405(n) is zero.
%C A048683 Indices of 0's in A048682. - _Sean A. Irvine_, Jun 26 2021
%F A048683 max{sqf kernel(C(n, k)} - sqf kernel(C(n, [ n/2 ])) = 0
%e A048683 For n=23 both the maximal and central largest-squarefree number dividing the corresponding {C(23,k)} values is 1352078=2*7*13*17*19*23=C(23,12) accidentally. The same 1352078 is the maximal-largest squarefree divisor for C(24,k) values but 1352078=C(24,12)/2. Thus both 23 and 24 are in this sequence.
%Y A048683 Analogous cases for A001221, A001222 functions as applied to {C(n, k)} are given in A020731 and A048627.
%Y A048683 Cf. A048682.
%K A048683 nonn
%O A048683 1,2
%A A048683 _Labos Elemer_
%E A048683 More terms from _Sean A. Irvine_, Jun 26 2021