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

1,2

Comments

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

First differs from A175084 at a(29).

Links

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

Example

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.

Sequence in context: A355547 A031975 A028729 * A175084 A171519 A072099

Adjacent sequences: A213364 A213365 A213366 * A213368 A213369 A213370

Keyword

nonn,easy

Author

Omar E. Pol, Aug 11 2012

Status

approved