1,2

Numbers n such that A000005(n)<> 3.

First differs from A175084 at a(29).

Table of n, a(n) for n=1..66.

4 is not in the sequence because 4 as three divisors: 1, 2, 4.

Complement of A001248. Column 3 of A210976.

Cf. A000005, A018252, A175084, A210994.

Sequence in context: A039122 A031975 A028729 * A175084 A171519 A072099

Adjacent sequences: A213364 A213365 A213366 * A213368 A213369 A213370

nonn,easy

Omar E. Pol, Aug 11 2012

approved