Him => 0 + 1 => 1 => 0 0 Him => 0 + 2 => 2 => 3 0 Him => 0 + 3 => 3 => 5 0 Him => 0 + 4 => 4 => 1 0 Him => 0 + 5 => 5 => 7 0 Him => 0 + 6 => 6 => 6 1 a b c d e a = start b = die roll c = start + die roll d = adjusted down for square, up for prime. e = is it a valid final number ?