Pattern Recognition - 179

Find out the next two numbers in the series.

12, 440, 15,521,18,_,_,..............

Answer 

12, 440, 15 ,521, 18,_,_,..............

440 = Reverse(12 * 12) -1 =441 -1 

521 = Reverse(15 * 15) -1 =522 -1 

Reverse(18 * 18) -1 =423 -1 = 422

12, 15 , 18 ,..........    Next number  21

12, 440, 15,521,18, 422,21,..............