3 ms·Once you notice that the primes are in the top rows, it becomes a pretty good comment.by cjfd 2y agoOnce you notice that the primes are in the top rows, it becomes a pretty good comment.xeyownt 2y agoJust learned that 9, 15, 21, ... are primes. Excellent comment ^^.froh 2y agowell, ackchyually, 'technically' the primes _are_ in there in that top row just not only primes ^^