For an explanation on the construction: http://math.stackexchange.com/questions/413296/how-does-the-divisibility-graphs-work http://math.stackexchange.com/quest

For an explanation on the construction: http://math.stackexchange.com/questions/413296/how-does-the-divisibility-graphs-work http://math.stackexchange.com/questions/413296/how-does-the-...