import rhinoscriptsyntax as rs
import random as ran

allobjs = rs.AllObjects()
rs.DeleteObjects(allobjs)

bsize = 10
dist = 1
offs = bsize + dist
num = 30

corners =  [(0,0,0), (bsize,0,0), (bsize,bsize,0), (0,bsize,0), (0,0,bsize), (bsize,0,bsize), (bsize,bsize,bsize), (0,bsize,bsize)]

rs.EnableRedraw(False)

for i in range(num):
    for j in range(num):
        if ((i+j)%6) and ((i-j)%3) and ((j-i)%5):
            box = rs.AddBox(corners)
            rs.MoveObject(box, (i*offs,j*offs,0))
            rs.ObjectColor(box, (255,0,0))
    
rs.EnableRedraw(True)