using the sequence of numbers from 1 to 10,000, sum the digits together and rewrite the numbers as a new sequence.
For example:
......., 345, 346, 347, ....., 5088, 5089,
becomes
........., 12, 13, 14, ......, 21, 22
find a systematic approach or shortcut to adding the numbers from this second sequence without brute force calculations.