For interest once you have the result 9* + 10* = 12*+1* and double the integers to read 18*+ 20* =24* +8*
and repeat the D* integer follows the series 1-8 - 27 .... so every new solution that includes a odd number is the begining of a new series.

CAPTCHA
This question is for testing whether you are a human visitor and to prevent automated spam submissions.