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Numbers that are not divisible by a smaller number that is a square greater than 1.
3

%I #7 Jun 09 2023 22:51:59

%S 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,

%T 35,37,38,39,41,42,43,46,47,49,51,53,55,57,58,59,61,62,65,66,67,69,70,

%U 71,73,74,77,78,79,82,83,85,86,87,89,91,93,94,95,97,101,102,103,105,106

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

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

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

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

%K nonn

%O 1,2

%A _Lee A. Newberg_, Oct 30 2009