from turtle import *

def ist_primzahl(n):
    if n < 2:
        return False
    if n == 2:
        return True
    if n % 2 == 0:
        return False
    for i in range(3, int(n**0.5) + 1, 2):
        if n % i == 0:
            return False
    return True

speed(0)
hideturtle()
pensize(3)
pu()
bk(400)
pd()
lt(90)
for i in range(300):
    if ist_primzahl(i):
        color("red")
    else:
        color("blue")
    fd(100)
    bk(100)
    rt(90)
    fd(3)
    lt(90)

done()