A326586 Odd numbers which do not satisfy Korselt's criterion, complement of A324050.

9, 15, 21, 25, 27, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 77, 81, 85, 87, 91, 93, 95, 99, 105, 111, 115, 117, 119, 121, 123, 125, 129, 133, 135, 141, 143, 145, 147, 153, 155, 159, 161, 165, 169, 171, 175, 177, 183, 185, 187, 189, 195, 201, 203, 205

Offset

1,1

Comments

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.

Links

Table of n, a(n) for n=1..57.

Formula

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

Mathematica

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

Crossrefs

Cf. A324050, A014076.

Sequence in context: A039769 A270574 A071904 * A014076 A067800 A155474

Adjacent sequences: A326583 A326584 A326585 * A326587 A326588 A326589

Keyword

nonn

Author

Peter Luschny, Jul 21 2019

Status

approved