A213367 Numbers that are not squares of primes.

1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70

Offset: 1

Author

Omar E. Pol, Aug 11 2012

Keywords

• nonn
• easy

Comments

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

First differs from A175084 at a(29).

Examples

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

Crossrefs

Complement of A001248. Column 3 of A210976.

Cf. A000005, A018252, A175084, A210994.