1,1

Number of prime divisors is always >= 3. For the least Carmichael number with n prime factors see A006931.

Amiram Eldar, Table of n, a(n) for n = 1..10000

a(n) = A001221(A002997(n)). - M. F. Hasler, Apr 14 2015

Cf. A002997, A006931.

Sequence in context: A053444 A175797 A243129 * A079083 A176171 A032568

Adjacent sequences: A135714 A135715 A135716 * A135718 A135719 A135720

nonn

Artur Jasinski, Nov 25 2007

approved