Question

Determinati D a pentru a apartine {21, 154, 144, 1000}

Answer 1

$D_{21}=\{1,3,7,21\}$
$D_{154}=\{1,2,7,11,14,22,77,154\}$
$D_{144}=\{1,2,3,4,6,8,9,12,16,18,24,36,72,144\}$
$D_{1000}=\{1,2,4,5,8,10,20,25,40,50,100,125,200,250,500,1000\}$