A326586 - OEIS

%I #9 Oct 16 2019 11:44:41

%S 9,15,21,25,27,33,35,39,45,49,51,55,57,63,65,69,75,77,81,85,87,91,93,

%T 95,99,105,111,115,117,119,121,123,125,129,133,135,141,143,145,147,

%U 153,155,159,161,165,169,171,175,177,183,185,187,189,195,201,203,205

%N Odd numbers which do not satisfy Korselt's criterion, complement of A324050.

%C 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 isA326586(n) = true if n != 1 and not isEven(n) and not isPrime(n) and not isCarmichael(n).

%t Select[Range[3, 205, 2], CompositeQ[#] && Mod[#, CarmichaelLambda[#]] != 1&] (* _Jean-François Alcover_, Oct 16 2019 *)

%Y Cf. A324050, A014076.

%K nonn

%O 1,1

%A _Peter Luschny_, Jul 21 2019