A167207 Numbers that are not divisible by a smaller number that is a square greater than 1.

1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 25, 26, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 65, 66, 67, 69, 70, 71, 73, 74, 77, 78, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 101, 102, 103, 105, 106

Offset

1,2

Links

Table of n, a(n) for n=1..70.

Example

14 is included because there is no square strictly between 1 and 14 that divides evenly into 14.

Prog

(PARI) isok(n) = {fordiv (n, d, if (issquare(d) && (d>1) && (d<n), return (0))); return (1); } \\ Michel Marcus, Jun 08 2013

Crossrefs

The union of A005117 (squarefree numbers) and A001248 (squares of primes).

Sequence in context: A342525 A325457 A063538 * A037143 A236105 A292050

Adjacent sequences: A167204 A167205 A167206 * A167208 A167209 A167210

Keyword

nonn

Author

Lee A. Newberg, Oct 30 2009

Status

approved