I didn't realize we were going beyond simple brute force.
20 minutes of coding later calculates up to the 4480 factor value in less than 2 seconds (on a slow machine).
This takes less than 45 seconds.
But I guess code is secret now.Code:Limit Index Number Factors
>= 1000 41040 842161320 1024
>= 2000 313599 49172323200 2304
>= 3000 453375 102774672000 3072
>= 4000 1890944 1787835551040 4480
>= 5000 2203200 2427046221600 5760
>= 6000 2756159 3798207594720 6144
>= 7000 7289919 26571463158240 7680
>= 8000 10497024 55093761676800 8640
>= 9000 11851839 70233049766880 9216
>=10000 14753024 108825865948800 13824