/sci/ - Science & Math

my math is a shit tire but i notice something that it might be interesting or obvious to some of you.
3, 6, 9
are interesting numbers and i notice a pattern when you multiply them linearly.
3*1 = 3
3*2 = 6
3*3 = 9
notice that 369 pattern will continue endlessly
3*4 = 12 ---> 1 + 2 = 3
3*5 = 15 ---> 1 + 5 = 6
3*6 = 18 ---> 1 + 8 = 9
etc..
also the same method can be implemented on 6 with a slightly different pattern
6 * 1 = 6
6 * 2 = 12 ---> 1 + 2 = 3
6 * 3 = 18 ---> 1 + 8 = 9
etc..
the 639 also repeat endlessly.
now lets look on 9
9 * 1 = 9
9 * 2 = 18 ---> 1 + 8 = 9
9 * 3 = 27 ---> 2 + 7 = 9
always 999.
now if you add 369 + 639 + 999 = 2007
2+0+0+7 = 9
multiply it by 2*2007 = 4014
4+0+1+4 = 9
4014*2 = 8028
8+0+2+8 = 18 ---> 1+8 = 9
and so on..
how the fuck is that possible?!