char_to_print = 48 #value for 0 caracter
char_pos =0
for x do 255 times
x_is_prime = 1
for y do x times
if (x / y) * y == x then # true if x is divicible by y
x_is_prime =0
end
end
if x_is_prime == 1 then
char_pos = char_pos + 1
char_draw(0, char_pos, char_to_print)
end
end