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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
Omar E. Pol, Aug 11 2012