#It's all in the title...
It's all in the title...
Take as input a positive integer n>=12
and... do what the title says.
Yes, this is on OEIS [A187924][1]A187924.
Some test cases
12 -> 912
13 -> 11713
14 -> 6314
15 -> 915
16 -> 3616
17 -> 15317
18 -> 918
19 -> 17119
20 -> 9920
40 -> 1999840
100-> 99999999999100
This is code-golf. Shortest code in bytes wins! [1]: https://oeis.org/A187924