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 A326586 #9 Oct 16 2019 11:44:41
%S A326586 9,15,21,25,27,33,35,39,45,49,51,55,57,63,65,69,75,77,81,85,87,91,93,
%T A326586 95,99,105,111,115,117,119,121,123,125,129,133,135,141,143,145,147,
%U A326586 153,155,159,161,165,169,171,175,177,183,185,187,189,195,201,203,205
%N A326586 Odd numbers which do not satisfy Korselt's criterion, complement of A324050.
%C A326586 The first number k > 1 not in this sequence but in A014076 is 561, because for every p in {3, 11, 17}, which are the prime divisors of 561, p - 1 divides 560.
%F A326586 isA326586(n) = true if n != 1 and not isEven(n) and not isPrime(n) and not isCarmichael(n).
%t A326586 Select[Range[3, 205, 2], CompositeQ[#] && Mod[#, CarmichaelLambda[#]] != 1&] (* _Jean-François Alcover_, Oct 16 2019 *)
%Y A326586 Cf. A324050, A014076.
%K A326586 nonn
%O A326586 1,1
%A A326586 _Peter Luschny_, Jul 21 2019